time | Calls | line |
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| | 7 | function result_map = ff_ipwkbz_fibs_vf_vecsv(varargin)
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| | 8 | %% FF_IPWKBZ_VF_VECSV solve infinite horizon exo shock + endo asset problem
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| | 9 | % This is a modified version of
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| | 10 | % <https://fanwangecon.github.io/CodeDynaAsset/m_ipwkbz/solve/html/ff_ipwkbz_vf_vecsv.html
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| | 11 | % ff_ipwkbz_vf_vecsv>, to see how this function solves the formal and
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| | 12 | % savings risky and safe asset problem with formal and informal choices,
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| | 13 | % compare the code here and from
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| | 14 | % <https://fanwangecon.github.io/CodeDynaAsset/m_ipwkbz/solve/html/ff_ipwkbz_vf_vecsv.html
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| | 15 | % ff_ipwkbz_vf_vecsv> side by side.
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| | 16 | %
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| | 17 | % @param param_map container parameter container
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| | 18 | %
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| | 19 | % @param support_map container support container
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| | 20 | %
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| | 21 | % @param armt_map container container with states, choices and shocks
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| | 22 | % grids that are inputs for grid based solution algorithm
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| | 23 | %
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| | 24 | % @param func_map container container with function handles for
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| | 25 | % consumption cash-on-hand etc.
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| | 26 | %
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| | 27 | % @return result_map container contains policy function matrix, value
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| | 28 | % function matrix, iteration results, and policy function, value function
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| | 29 | % and iteration results tables.
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| | 30 | %
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| | 31 | % keys included in result_map:
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| | 32 | %
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| | 33 | % * mt_val matrix states_n by shock_n matrix of converged value function grid
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| | 34 | % * mt_pol_a matrix states_n by shock_n matrix of converged policy function grid
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| | 35 | % * ar_val_diff_norm array if bl_post = true it_iter_last by 1 val function
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| | 36 | % difference between iteration
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| | 37 | % * ar_pol_diff_norm array if bl_post = true it_iter_last by 1 policy
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| | 38 | % function difference between iterations
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| | 39 | % * mt_pol_perc_change matrix if bl_post = true it_iter_last by shock_n the
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| | 40 | % proportion of grid points at which policy function changed between
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| | 41 | % current and last iteration for each element of shock
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| | 42 | %
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| | 43 | % @example
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| | 44 | %
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| | 45 | % @include
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| | 46 | %
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| | 47 | % * <https://github.com/FanWangEcon/CodeDynaAsset/blob/master/m_ipwkbz/paramfunc/ff_ipwkbz_evf.m ff_ipwkbz_evf>
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| | 48 | % * <https://github.com/FanWangEcon/CodeDynaAsset/blob/master/m_ipwkbz/paramfunc/ffs_ipwkbz_set_default_param.m ffs_ipwkbz_set_default_param>
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| | 49 | % * <https://github.com/FanWangEcon/CodeDynaAsset/blob/master/m_ipwkbz/paramfunc/ffs_ipwkbz_get_funcgrid.m ffs_ipwkbz_get_funcgrid>
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| | 50 | % * <https://github.com/FanWangEcon/CodeDynaAsset/blob/master/m_akz/solvepost/ff_akz_vf_post.m ff_akz_vf_post>
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| | 51 | %
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| | 52 |
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| | 53 | %% Default
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| | 54 | % * it_param_set = 1: quick test
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| | 55 | % * it_param_set = 2: benchmark run
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| | 56 | % * it_param_set = 3: benchmark profile
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| | 57 | % * it_param_set = 4: press publish button
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| | 58 |
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| | 59 | it_param_set = 3;
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| | 60 | [param_map, support_map] = ffs_ipwkbz_fibs_set_default_param(it_param_set);
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| | 61 |
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| | 62 | % parameters can be set inside ffs_ipwkbz_set_default_param or updated here
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| | 63 | % param_map('it_w_perc_n') = 50;
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| | 64 | % param_map('it_ak_perc_n') = param_map('it_w_perc_n');
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| | 65 | % param_map('it_z_n') = 15;
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| | 66 | % param_map('fl_coh_interp_grid_gap') = 0.025;
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| | 67 | % param_map('it_c_interp_grid_gap') = 0.001;
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| | 68 | % param_map('fl_w_interp_grid_gap') = 0.25;
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| | 69 | % param_map('it_w_perc_n') = 100;
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| | 70 | % param_map('it_ak_perc_n') = param_map('it_w_perc_n');
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| | 71 | % param_map('it_z_n') = 11;
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| | 72 | % param_map('fl_coh_interp_grid_gap') = 0.1;
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| | 73 | % param_map('it_c_interp_grid_gap') = 10^-4;
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| | 74 | % param_map('fl_w_interp_grid_gap') = 0.1;
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| | 75 |
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| | 76 | % get armt and func map
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| | 77 | params_len = length(varargin);
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| | 78 | if params_len <= 2
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| | 79 | [armt_map, func_map] = ffs_ipwkbz_fibs_get_funcgrid(param_map, support_map); % 1 for override
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| | 80 | default_params = {param_map support_map armt_map func_map};
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| | 81 | end
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| | 82 |
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| | 83 | %% Parse Parameters 1
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| | 84 |
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| | 85 | % if varargin only has param_map and support_map,
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| | 86 | [default_params{1:params_len}] = varargin{:};
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| | 87 | param_map = [param_map; default_params{1}];
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| | 88 | support_map = [support_map; default_params{2}];
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| | 89 | if params_len >= 1 && params_len <= 2
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| | 90 | % If override param_map, re-generate armt and func if they are not
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| | 91 | % provided
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| | 92 | [armt_map, func_map] = ffs_ipwkbz_fibs_get_funcgrid(param_map, support_map);
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| | 93 | else
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| | 94 | % Override all
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| | 95 | armt_map = default_params{3};
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| | 96 | func_map = default_params{4};
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| | 97 | end
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| | 98 |
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| | 99 | % append function name
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| | 100 | st_func_name = 'ff_ipwkbz_fibs_vf_vecsv';
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| | 101 | support_map('st_profile_name_main') = [st_func_name support_map('st_profile_name_main')];
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| | 102 | support_map('st_mat_name_main') = [st_func_name support_map('st_mat_name_main')];
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| | 103 | support_map('st_img_name_main') = [st_func_name support_map('st_img_name_main')];
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| | 104 |
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| | 105 | %% Parse Parameters 2
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| | 106 |
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| | 107 | % armt_map
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| | 108 | params_group = values(armt_map, ...
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| | 109 | {'ar_w_perc', 'ar_w_level_full', 'ar_coh_bridge_perc', 'ar_z'});
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| | 110 | [ar_w_perc, ar_w_level_full, ar_coh_bridge_perc, ar_z] = params_group{:};
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| | 111 | params_group = values(armt_map, {'ar_interp_c_grid', 'ar_interp_coh_grid', ...
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| | 112 | 'ar_a_meshk', 'ar_k_mesha', ...
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| | 113 | 'mt_interp_coh_grid_mesh_z', 'mt_z_mesh_coh_interp_grid',...
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| | 114 | 'mt_interp_coh_grid_mesh_w_perc',...
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| | 115 | 'mt_w_level_neg_mesh_coh_bridge_perc', 'mt_coh_bridge_perc_mesh_w_level_neg',...
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| | 116 | 'mt_bl_w_by_interp_coh_interp_grid_wneg', ...
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| | 117 | 'mt_w_by_interp_coh_interp_grid_wneg', 'mt_w_by_interp_coh_interp_grid_wpos', 'mt_coh_w_perc_ratio_wneg'});
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| | 118 | [ar_interp_c_grid, ar_interp_coh_grid, ar_a_meshk, ar_k_mesha, ...
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| | 119 | mt_interp_coh_grid_mesh_z, mt_z_mesh_coh_interp_grid, ...
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| | 120 | mt_interp_coh_grid_mesh_w_perc,...
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| | 121 | mt_w_level_neg_mesh_coh_bridge_perc, mt_coh_bridge_perc_mesh_w_level_neg, ...
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| | 122 | mt_bl_w_by_interp_coh_interp_grid_wneg, ...
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| | 123 | mt_w_by_interp_coh_interp_grid_wneg, mt_w_by_interp_coh_interp_grid_wpos, mt_coh_w_perc_ratio_wneg] ...
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| | 124 | = params_group{:};
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| | 125 |
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| | 126 | params_group = values(armt_map, {'mt_coh_wkb', 'mt_z_mesh_coh_wkb'});
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| | 127 | [mt_coh_wkb, mt_z_mesh_coh_wkb] = params_group{:};
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| | 128 |
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| | 129 | % armt_map
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| | 130 | % Formal choice Menu/Grid and Interest Rate Menu/Grid
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| | 131 | params_group = values(armt_map, {'ar_forbrblk_r', 'ar_forbrblk'});
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| | 132 | [ar_forbrblk_r, ar_forbrblk] = params_group{:};
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| | 133 |
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| | 134 | % func_map
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| | 135 | params_group = values(func_map, {'f_util_log', 'f_util_crra', 'f_cons'});
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| | 136 | [f_util_log, f_util_crra, f_cons] = params_group{:};
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| | 137 |
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| | 138 | % param_map
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| | 139 | params_group = values(param_map, {'it_z_n', 'fl_crra', 'fl_beta', ...
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| | 140 | 'fl_nan_replace', 'fl_c_min', 'bl_bridge', 'bl_default', 'fl_default_wprime'});
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| | 141 | [it_z_n, fl_crra, fl_beta, fl_nan_replace, fl_c_min, bl_bridge, bl_default, fl_default_wprime] = params_group{:};
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| | 142 | params_group = values(param_map, {'it_maxiter_val', 'fl_tol_val', 'fl_tol_pol', 'it_tol_pol_nochange'});
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| | 143 | [it_maxiter_val, fl_tol_val, fl_tol_pol, it_tol_pol_nochange] = params_group{:};
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| | 144 |
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| | 145 | % support_map
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| | 146 | params_group = values(support_map, {'bl_profile', 'st_profile_path', ...
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| | 147 | 'st_profile_prefix', 'st_profile_name_main', 'st_profile_suffix',...
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| | 148 | 'bl_time', 'bl_display_defparam', 'bl_graph_evf', 'bl_display', 'it_display_every', 'bl_post'});
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| | 149 | [bl_profile, st_profile_path, ...
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| | 150 | st_profile_prefix, st_profile_name_main, st_profile_suffix, ...
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| | 151 | bl_time, bl_display_defparam, bl_graph_evf, bl_display, it_display_every, bl_post] = params_group{:};
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| | 152 | params_group = values(support_map, {'it_display_summmat_rowmax', 'it_display_summmat_colmax'});
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| | 153 | [it_display_summmat_rowmax, it_display_summmat_colmax] = params_group{:};
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| | 154 |
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| | 155 | %% Initialize Output Matrixes
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| | 156 |
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| | 157 | mt_val_cur = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 158 | mt_val = mt_val_cur - 1;
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| | 159 | mt_pol_a = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 160 | mt_pol_a_cur = mt_pol_a - 1;
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| | 161 | mt_pol_k = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 162 | mt_pol_k_cur = mt_pol_k - 1;
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| | 163 | mt_pol_idx = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 164 |
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| | 165 | % collect optimal borrowing formal and informal choices
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| | 166 | % mt_pol_b_with_r: cost to t+1 consumption from borrowing in t
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| | 167 | mt_pol_b_with_r = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 168 | mt_pol_b_bridge = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 169 | mt_pol_inf_borr_nobridge = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 170 | mt_pol_for_borr = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 171 | mt_pol_for_save = zeros(length(ar_interp_coh_grid),length(ar_z));
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| | 172 |
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| | 173 | % We did not need these in ff_oz_vf or ff_oz_vf_vec
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| | 174 | % see
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| | 175 | % <https://fanwangecon.github.io/M4Econ/support/speed/partupdate/fs_u_c_partrepeat_main.html
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| | 176 | % fs_u_c_partrepeat_main> for why store using cells.
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| | 177 | cl_u_c_store = cell([it_z_n, 1]);
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| | 178 | cl_c_valid_idx = cell([it_z_n, 1]);
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| | 179 | cl_w_kstar_interp_z = cell([it_z_n, 1]);
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| | 180 | for it_z_i = 1:length(ar_z)
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| | 181 | cl_w_kstar_interp_z{it_z_i} = zeros([length(ar_w_perc), length(ar_interp_coh_grid)]) - 1;
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| | 182 | end
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| | 183 |
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| | 184 | %% Initialize Convergence Conditions
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| | 185 |
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| | 186 | bl_vfi_continue = true;
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| | 187 | it_iter = 0;
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| | 188 | ar_val_diff_norm = zeros([it_maxiter_val, 1]);
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| | 189 | ar_pol_diff_norm = zeros([it_maxiter_val, 1]);
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| | 190 | mt_pol_perc_change = zeros([it_maxiter_val, it_z_n]);
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| | 191 |
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| | 192 | %% Pre-calculate u(c)
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| | 193 | % Interpolation, see
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| | 194 | % <https://fanwangecon.github.io/M4Econ/support/speed/partupdate/fs_u_c_partrepeat_main.html
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| | 195 | % fs_u_c_partrepeat_main> for why interpolate over u(c)
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| | 196 |
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| | 197 | % Evaluate
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| | 198 | if (fl_crra == 1)
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| | 199 | ar_interp_u_of_c_grid = f_util_log(ar_interp_c_grid);
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| | 200 | fl_u_cmin = f_util_log(fl_c_min);
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| | 201 | else
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| | 202 | ar_interp_u_of_c_grid = f_util_crra(ar_interp_c_grid);
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| | 203 | fl_u_cmin = f_util_crra(fl_c_min);
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| | 204 | end
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| | 205 | ar_interp_u_of_c_grid(ar_interp_c_grid <= fl_c_min) = fl_u_cmin;
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| | 206 |
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| | 207 | % Get Interpolant
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| | 208 | f_grid_interpolant_spln = griddedInterpolant(ar_interp_c_grid, ar_interp_u_of_c_grid, 'spline', 'nearest');
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| | 209 |
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| | 210 | %% Iterate Value Function
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| | 211 | % Loop solution with 4 nested loops
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| | 212 | %
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| | 213 | % # loop 1: over exogenous states
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| | 214 | % # loop 2: over endogenous states
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| | 215 | % # loop 3: over choices
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| | 216 | % # loop 4: add future utility, integration--loop over future shocks
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| | 217 | %
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| | 218 |
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| | 219 | % Start Profile
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| | 220 | if (bl_profile)
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| | 221 | close all;
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| | 222 | profile off;
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| | 223 | profile on;
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< 0.001 | 1 | 224 | end
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| | 225 |
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| | 226 | % Start Timer
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< 0.001 | 1 | 227 | if (bl_time)
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< 0.001 | 1 | 228 | tic;
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< 0.001 | 1 | 229 | end
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| | 230 |
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| | 231 | % Value Function Iteration
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< 0.001 | 1 | 232 | while bl_vfi_continue
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< 0.001 | 135 | 233 | it_iter = it_iter + 1;
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| | 234 |
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| | 235 | %% Interpolate (1) reacahble v(coh(k(w,z),b(w,z),z),z) given v(coh, z)
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| | 236 | % This is the same as <https://fanwangecon.github.io/CodeDynaAsset/m_ipwkbz/solve/html/ff_ipwkbz_vf_vecsv.html
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| | 237 | % ff_ipwkbz_vf_vecsv>. For the FIBS problem, the cash-on-hand
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| | 238 | % interpolation grid stays the same, and the shock grid stays the same
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| | 239 | % as well. The results will not be the same, for example, the coh_grid
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| | 240 | % max is the max of reachable cash-on-hand levels (min is however just
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| | 241 | % the borrowing bound).
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| | 242 |
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| | 243 | % Generate Interpolant for v(coh,z)
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0.049 | 135 | 244 | f_grid_interpolant_value = griddedInterpolant(...
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| 135 | 245 | mt_z_mesh_coh_interp_grid', mt_interp_coh_grid_mesh_z', mt_val_cur', 'linear', 'nearest');
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| | 246 |
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| | 247 | % Interpolate for v(coh(k(w,z),b(w,z),z),z)
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1.878 | 135 | 248 | mt_val_wkb_interpolated = f_grid_interpolant_value(mt_z_mesh_coh_wkb, mt_coh_wkb);
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| | 249 |
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| | 250 | %% Solve Second Stage Problem k*(w,z)
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| | 251 | % This is again the same as <https://fanwangecon.github.io/CodeDynaAsset/m_ipwkbz/solve/html/ff_ipwkbz_vf_vecsv.html
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| | 252 | % ff_ipwkbz_vf_vecsv>. But the output matrix sizes are different.
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| | 253 | % Previously, they were (length(ar_w_level)) by (length(ar_z)). Now
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| | 254 | % have this thing which is stored (length(ar_w_level_full)) by
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| | 255 | % (length(ar_z)). _ar_w_level_full_ includes not just different levels
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| | 256 | % of _ar_w_level_, but also repeats the elements of _ar_w_level_ that
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| | 257 | % are < 0 by _it_coh_bridge_perc_n_ times, starting with what
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| | 258 | % corresponds to 100 percent of w should go to cover bridge loan, until
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| | 259 | % 0 percent for w < 0, which then proceeds to w > 0. So the last
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| | 260 | % segment of _ar_w_level_full_ is the same as ar_w_level:
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| | 261 | % ar_w_level_full((end-length(ar_w_level)+1):end) = ar_w_level.
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| | 262 |
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0.013 | 135 | 263 | support_map('bl_graph_evf') = false;
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< 0.001 | 135 | 264 | if (it_iter == (it_maxiter_val + 1))
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< 0.001 | 1 | 265 | support_map('bl_graph_evf') = bl_graph_evf;
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< 0.001 | 1 | 266 | end
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< 0.001 | 135 | 267 | bl_input_override = true;
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0.924 | 135 | 268 | [mt_ev_condi_z_max, ~, mt_ev_condi_z_max_kp, ~] = ...
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| 135 | 269 | ff_ipwkbz_fibs_evf(mt_val_wkb_interpolated, param_map, support_map, armt_map, bl_input_override);
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| | 270 |
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| | 271 | %% Solve First Stage Problem w*(z) given k*(w,z)
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| | 272 | % Refer to
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| | 273 | % <https://fanwangecon.github.io/CodeDynaAsset/m_ipwkbz/solve/html/ff_ipwkbz_fibs_vf_vecsv.html
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| | 274 | % ff_ipwkbz_fibs_vf_vecsv> where the problem was solved without formal and
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| | 275 | % informal choices that allow for bridge loans to see line by line how
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| | 276 | % code differ. Some of the comments from that file are not here to save
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| | 277 | % space. Comments here address differences and are specific to formal
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| | 278 | % and informal choices.
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| | 279 |
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| | 280 | % loop 1: over exogenous states
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< 0.001 | 135 | 281 | for it_z_i = 1:length(ar_z)
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| | 282 |
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| | 283 | %% A. Interpolate FULL to get k*(coh_level, w_perc, z), b*(k,w) based on k*(coh_perc, w_level)
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| | 284 | % additionally, Interpolate FULL EV(k*(coh_level, w_perc, z), w -
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| | 285 | % b*|z) based on EV(k*(coh_perc, w_level))
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| | 286 | %
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| | 287 | % we solved the second period problem in ff_ipwkbz_fibs_fibs_evf.m
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| | 288 | % above. To use results, we need to interpolate in the following
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| | 289 | % way to obtain *mt_w_kstar_interp_z* as well as
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| | 290 | % *mt_ev_condi_z_max_interp_z*:
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| | 291 | %
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| | 292 | % # Interp STG1A: for $w > 0$, 1D interpolate over w level, given z
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| | 293 | % # Interp STG1B: for $w < 0$, 2D interpolate over w level and coh
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| | 294 | % perceng, given z
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| | 295 | %
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| | 296 |
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| | 297 | % 1. Negative Elements of w grid expanded by w percentages for bridge
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0.007 | 2025 | 298 | ar_bl_w_level_full_neg = (ar_w_level_full < 0);
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| | 299 |
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| | 300 | % 2. Current Positve w and negative w optimal k choices
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0.007 | 2025 | 301 | it_wneg_mt_row = sum(ar_bl_w_level_full_neg)/length(ar_coh_bridge_perc);
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| | 302 | % for mt_ev_condi_z_max_kp
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0.017 | 2025 | 303 | ar_ev_condi_z_max_kp_wpos = mt_ev_condi_z_max_kp(~ar_bl_w_level_full_neg, it_z_i)';
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0.013 | 2025 | 304 | ar_ev_condi_z_max_kp_wneg = mt_ev_condi_z_max_kp(ar_bl_w_level_full_neg, it_z_i)';
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0.006 | 2025 | 305 | mt_ev_condi_z_max_kp_wneg = reshape(ar_ev_condi_z_max_kp_wneg, [it_wneg_mt_row, length(ar_coh_bridge_perc)]);
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| | 306 | % for mt_ev_condi_z_max
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0.015 | 2025 | 307 | ar_ev_condi_z_max_wpos = mt_ev_condi_z_max(~ar_bl_w_level_full_neg, it_z_i)';
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0.013 | 2025 | 308 | ar_ev_condi_z_max_wneg = mt_ev_condi_z_max(ar_bl_w_level_full_neg, it_z_i)';
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0.003 | 2025 | 309 | mt_ev_condi_z_max_wneg = reshape(ar_ev_condi_z_max_wneg, [it_wneg_mt_row, length(ar_coh_bridge_perc)]);
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| | 310 |
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| | 311 | % 2. Interp STG1A for w > 0
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0.013 | 2025 | 312 | ar_w_level_full_pos = ar_w_level_full(~ar_bl_w_level_full_neg);
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| | 313 | % Interpolation for mt_ev_condi_z_max_kp
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0.069 | 2025 | 314 | f_interpolante_w_level_pos_kstar_z = griddedInterpolant(ar_w_level_full_pos, ar_ev_condi_z_max_kp_wpos, 'linear', 'nearest');
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0.235 | 2025 | 315 | mt_w_kstar_interp_z_wpos = f_interpolante_w_level_pos_kstar_z(mt_w_by_interp_coh_interp_grid_wpos(:));
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0.023 | 2025 | 316 | mt_w_astar_interp_z_wpos = mt_w_by_interp_coh_interp_grid_wpos(:) - mt_w_kstar_interp_z_wpos;
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| | 317 | % Interpolation for mt_ev_condi_z_max
|
0.056 | 2025 | 318 | f_interpolante_w_level_pos_ev_z = griddedInterpolant(ar_w_level_full_pos, ar_ev_condi_z_max_wpos, 'linear', 'nearest');
|
0.169 | 2025 | 319 | mt_w_ev_interp_z_wpos = f_interpolante_w_level_pos_ev_z(mt_w_by_interp_coh_interp_grid_wpos(:));
|
| | 320 |
|
| | 321 | % 3. Interp STG1B for w <= 0
|
< 0.001 | 2025 | 322 | if (bl_bridge)
|
| | 323 | % Interpolation for mt_ev_condi_z_max_kp
|
0.083 | 2025 | 324 | f_interpolante_w_level_neg_kstar_z = griddedInterpolant(...
|
| 2025 | 325 | mt_coh_bridge_perc_mesh_w_level_neg', mt_w_level_neg_mesh_coh_bridge_perc', ...
|
| 2025 | 326 | mt_ev_condi_z_max_kp_wneg', 'linear', 'nearest');
|
0.402 | 2025 | 327 | mt_w_kstar_interp_z_wneg = f_interpolante_w_level_neg_kstar_z(mt_coh_w_perc_ratio_wneg(:), mt_w_by_interp_coh_interp_grid_wneg(:));
|
0.025 | 2025 | 328 | mt_w_astar_interp_z_wneg = mt_w_by_interp_coh_interp_grid_wneg(:) - mt_w_kstar_interp_z_wneg;
|
| | 329 | % Interpolation for mt_ev_condi_z_max
|
0.086 | 2025 | 330 | f_interpolante_w_level_neg_ev_z = griddedInterpolant(...
|
| 2025 | 331 | mt_coh_bridge_perc_mesh_w_level_neg', mt_w_level_neg_mesh_coh_bridge_perc', ...
|
| 2025 | 332 | mt_ev_condi_z_max_wneg', 'linear', 'nearest');
|
0.408 | 2025 | 333 | mt_w_ev_interp_z_wneg = f_interpolante_w_level_neg_ev_z(mt_coh_w_perc_ratio_wneg(:), mt_w_by_interp_coh_interp_grid_wneg(:));
|
| | 334 | else
|
| | 335 | ar_w_level_full_neg = ar_w_level_full(ar_bl_w_level_full_neg);
|
| | 336 | % Interpolation for mt_ev_condi_z_max_kp
|
| | 337 | f_interpolante_w_level_neg_kstar_z = griddedInterpolant(ar_w_level_full_neg, ar_ev_condi_z_max_kp_wneg, 'linear', 'nearest');
|
| | 338 | mt_w_kstar_interp_z_wneg = f_interpolante_w_level_neg_kstar_z(mt_w_by_interp_coh_interp_grid_wneg(:));
|
| | 339 | mt_w_astar_interp_z_wneg = mt_w_by_interp_coh_interp_grid_wneg(:) - mt_w_kstar_interp_z_wneg;
|
| | 340 | % Interpolation for mt_ev_condi_z_max
|
| | 341 | f_interpolante_w_level_neg_ev_z = griddedInterpolant(ar_w_level_full_neg, ar_ev_condi_z_max_wneg, 'linear', 'nearest');
|
| | 342 | mt_w_ev_interp_z_wneg = f_interpolante_w_level_neg_ev_z(mt_w_by_interp_coh_interp_grid_wneg(:));
|
< 0.001 | 2025 | 343 | end
|
| | 344 |
|
| | 345 | % 4. Combine positive and negative aggregate savings matrix
|
| | 346 | % check: mt_w_by_interp_coh_interp_grid vs mt_w_astar_interp_z + mt_w_kstar_interp_z
|
| | 347 | % combine for mt_ev_condi_z_max_kp
|
0.091 | 2025 | 348 | mt_w_kstar_interp_z = zeros(size(mt_bl_w_by_interp_coh_interp_grid_wneg));
|
0.228 | 2025 | 349 | mt_w_kstar_interp_z(~mt_bl_w_by_interp_coh_interp_grid_wneg) = mt_w_kstar_interp_z_wpos;
|
0.208 | 2025 | 350 | mt_w_kstar_interp_z(mt_bl_w_by_interp_coh_interp_grid_wneg) = mt_w_kstar_interp_z_wneg;
|
0.144 | 2025 | 351 | mt_w_astar_interp_z = zeros(size(mt_bl_w_by_interp_coh_interp_grid_wneg));
|
0.252 | 2025 | 352 | mt_w_astar_interp_z(~mt_bl_w_by_interp_coh_interp_grid_wneg) = mt_w_astar_interp_z_wpos;
|
0.200 | 2025 | 353 | mt_w_astar_interp_z(mt_bl_w_by_interp_coh_interp_grid_wneg) = mt_w_astar_interp_z_wneg;
|
| | 354 | % combine for mt_ev_condi_z_max
|
0.139 | 2025 | 355 | mt_ev_condi_z_max_interp_z = zeros(size(mt_bl_w_by_interp_coh_interp_grid_wneg));
|
0.244 | 2025 | 356 | mt_ev_condi_z_max_interp_z(~mt_bl_w_by_interp_coh_interp_grid_wneg) = mt_w_ev_interp_z_wpos;
|
0.200 | 2025 | 357 | mt_ev_condi_z_max_interp_z(mt_bl_w_by_interp_coh_interp_grid_wneg) = mt_w_ev_interp_z_wneg;
|
| | 358 |
|
| | 359 | % 5. changes in w_perc kstar choices
|
0.065 | 2025 | 360 | mt_w_kstar_diff_idx = (cl_w_kstar_interp_z{it_z_i} ~= mt_w_kstar_interp_z);
|
| | 361 |
|
| | 362 | %% B. Calculate UPDATE u(c) Update: u(c(coh_level, w_perc)) given k*_interp, b*_interp
|
0.212 | 2025 | 363 | ar_c = f_cons(mt_interp_coh_grid_mesh_w_perc(mt_w_kstar_diff_idx), ...
|
| 2025 | 364 | mt_w_astar_interp_z(mt_w_kstar_diff_idx), ...
|
| 2025 | 365 | mt_w_kstar_interp_z(mt_w_kstar_diff_idx));
|
| | 366 |
|
0.006 | 2025 | 367 | ar_it_c_valid_idx = (ar_c <= fl_c_min);
|
| | 368 | % EVAL current utility: N by N, f_util defined earlier
|
0.139 | 2025 | 369 | ar_utility_update = f_grid_interpolant_spln(ar_c);
|
| | 370 |
|
| | 371 | % Update Storage
|
< 0.001 | 2025 | 372 | if (it_iter == 1)
|
< 0.001 | 15 | 373 | cl_u_c_store{it_z_i} = reshape(ar_utility_update, [length(ar_w_perc), length(ar_interp_coh_grid)]);
|
< 0.001 | 15 | 374 | cl_c_valid_idx{it_z_i} = reshape(ar_it_c_valid_idx, [length(ar_w_perc), length(ar_interp_coh_grid)]);
|
< 0.001 | 2010 | 375 | else
|
0.060 | 2010 | 376 | cl_u_c_store{it_z_i}(mt_w_kstar_diff_idx) = ar_utility_update;
|
0.050 | 2010 | 377 | cl_c_valid_idx{it_z_i}(mt_w_kstar_diff_idx) = ar_it_c_valid_idx;
|
< 0.001 | 2025 | 378 | end
|
0.095 | 2025 | 379 | cl_w_kstar_interp_z{it_z_i} = mt_w_kstar_interp_z;
|
| | 380 |
|
| | 381 | %% D. Compute FULL U(coh_level, w_perc, z) over all w_perc
|
0.062 | 2025 | 382 | mt_utility = cl_u_c_store{it_z_i} + fl_beta*mt_ev_condi_z_max_interp_z;
|
| | 383 |
|
| | 384 | % Index update
|
| | 385 | % using the method below is much faster than index replace
|
| | 386 | % see <https://fanwangecon.github.io/M4Econ/support/speed/index/fs_subscript.html fs_subscript>
|
0.001 | 2025 | 387 | mt_it_c_valid_idx = cl_c_valid_idx{it_z_i};
|
| | 388 | % Default or Not Utility Handling
|
< 0.001 | 2025 | 389 | if (bl_default)
|
| | 390 | % if default: only today u(cmin), transition out next period, debt wiped out
|
0.041 | 2025 | 391 | fl_v_default = fl_u_cmin + fl_beta*f_interpolante_w_level_pos_ev_z(fl_default_wprime);
|
0.045 | 2025 | 392 | mt_utility = mt_utility.*(~mt_it_c_valid_idx) + fl_v_default*(mt_it_c_valid_idx);
|
| | 393 | else
|
| | 394 | % if default is not allowed: v = u(cmin)
|
| | 395 | mt_utility = mt_utility.*(~mt_it_c_valid_idx) + fl_nan_replace*(mt_it_c_valid_idx);
|
< 0.001 | 2025 | 396 | end
|
| | 397 |
|
| | 398 | % percentage algorithm does not have invalid (check to make sure
|
| | 399 | % min percent is not 0 in ffs_ipwkbz_fibs_get_funcgrid.m)
|
| | 400 | % mt_utility = mt_utility.*(~mt_it_c_valid_idx) + fl_u_neg_c*(mt_it_c_valid_idx);
|
| | 401 |
|
| | 402 | %% E. Optimize Over Choices: max_{w_perc} U(coh_level, w_perc, z)
|
| | 403 | % Optimization: remember matlab is column major, rows must be
|
| | 404 | % choices, columns must be states
|
| | 405 | % <https://en.wikipedia.org/wiki/Row-_and_column-major_order COLUMN-MAJOR>
|
0.113 | 2025 | 406 | [ar_opti_val_z, ar_opti_idx_z] = max(mt_utility);
|
| | 407 |
|
| | 408 | % Generate Linear Opti Index
|
0.006 | 2025 | 409 | [it_choies_n, it_states_n] = size(mt_utility);
|
0.026 | 2025 | 410 | ar_add_grid = linspace(0, it_choies_n*(it_states_n-1), it_states_n);
|
0.002 | 2025 | 411 | ar_opti_linear_idx_z = ar_opti_idx_z + ar_add_grid;
|
| | 412 |
|
0.016 | 2025 | 413 | ar_opti_aprime_z = mt_w_astar_interp_z(ar_opti_linear_idx_z);
|
0.015 | 2025 | 414 | ar_opti_kprime_z = mt_w_kstar_interp_z(ar_opti_linear_idx_z);
|
0.017 | 2025 | 415 | ar_opti_c_z = f_cons(ar_interp_coh_grid, ar_opti_aprime_z, ar_opti_kprime_z);
|
| | 416 |
|
| | 417 | % Handle Default is optimal or not
|
< 0.001 | 2025 | 418 | if (bl_default)
|
| | 419 | % if defaulting is optimal choice, at these states, not required
|
| | 420 | % to default, non-default possible, but default could be optimal
|
0.050 | 2025 | 421 | fl_default_opti_kprime = f_interpolante_w_level_pos_kstar_z(fl_default_wprime);
|
0.009 | 2025 | 422 | ar_opti_aprime_z(ar_opti_c_z <= fl_c_min) = fl_default_wprime - fl_default_opti_kprime;
|
0.005 | 2025 | 423 | ar_opti_kprime_z(ar_opti_c_z <= fl_c_min) = fl_default_opti_kprime;
|
| | 424 | else
|
| | 425 | % if default is not allowed, then next period same state as now
|
| | 426 | % this is absorbing state, this is the limiting case, single
|
| | 427 | % state space point, lowest a and lowest shock has this.
|
| | 428 | ar_opti_aprime_z(ar_opti_c_z <= fl_c_min) = min(ar_a_meshk);
|
| | 429 | ar_opti_kprime_z(ar_opti_c_z <= fl_c_min) = min(ar_k_mesha);
|
< 0.001 | 2025 | 430 | end
|
| | 431 |
|
| | 432 | %% F. Store Results
|
0.010 | 2025 | 433 | mt_val(:,it_z_i) = ar_opti_val_z;
|
0.005 | 2025 | 434 | mt_pol_a(:,it_z_i) = ar_opti_aprime_z;
|
0.005 | 2025 | 435 | mt_pol_k(:,it_z_i) = ar_opti_kprime_z;
|
0.001 | 2025 | 436 | if (it_iter == (it_maxiter_val + 1))
|
< 0.001 | 15 | 437 | mt_pol_idx(:,it_z_i) = ar_opti_linear_idx_z;
|
< 0.001 | 15 | 438 | end
|
| | 439 |
|
0.002 | 2025 | 440 | end
|
| | 441 |
|
| | 442 | %% Check Tolerance and Continuation
|
| | 443 |
|
| | 444 | % Difference across iterations
|
0.049 | 135 | 445 | ar_val_diff_norm(it_iter) = norm(mt_val - mt_val_cur);
|
0.078 | 135 | 446 | ar_pol_diff_norm(it_iter) = norm(mt_pol_a - mt_pol_a_cur) + norm(mt_pol_k - mt_pol_k_cur);
|
0.010 | 135 | 447 | ar_pol_a_perc_change = sum((mt_pol_a ~= mt_pol_a_cur))/(length(ar_interp_coh_grid));
|
0.007 | 135 | 448 | ar_pol_k_perc_change = sum((mt_pol_k ~= mt_pol_k_cur))/(length(ar_interp_coh_grid));
|
0.017 | 135 | 449 | mt_pol_perc_change(it_iter, :) = mean([ar_pol_a_perc_change;ar_pol_k_perc_change]);
|
| | 450 |
|
| | 451 | % Update
|
0.004 | 135 | 452 | mt_val_cur = mt_val;
|
0.003 | 135 | 453 | mt_pol_a_cur = mt_pol_a;
|
0.002 | 135 | 454 | mt_pol_k_cur = mt_pol_k;
|
| | 455 |
|
| | 456 | % Print Iteration Results
|
< 0.001 | 135 | 457 | if (bl_display && (rem(it_iter, it_display_every)==0))
|
| | 458 | fprintf('VAL it_iter:%d, fl_diff:%d, fl_diff_pol:%d\n', ...
|
| | 459 | it_iter, ar_val_diff_norm(it_iter), ar_pol_diff_norm(it_iter));
|
| | 460 | tb_valpol_iter = array2table([mean(mt_val_cur,1);...
|
| | 461 | mean(mt_pol_a_cur,1); ...
|
| | 462 | mean(mt_pol_k_cur,1); ...
|
| | 463 | mt_val_cur(length(ar_interp_coh_grid),:); ...
|
| | 464 | mt_pol_a_cur(length(ar_interp_coh_grid),:); ...
|
| | 465 | mt_pol_k_cur(length(ar_interp_coh_grid),:)]);
|
| | 466 | tb_valpol_iter.Properties.VariableNames = strcat('z', string((1:size(mt_val_cur,2))));
|
| | 467 | tb_valpol_iter.Properties.RowNames = {'mval', 'map', 'mak', 'Hval', 'Hap', 'Hak'};
|
| | 468 | disp('mval = mean(mt_val_cur,1), average value over a')
|
| | 469 | disp('map = mean(mt_pol_a_cur,1), average choice over a')
|
| | 470 | disp('mkp = mean(mt_pol_k_cur,1), average choice over k')
|
| | 471 | disp('Hval = mt_val_cur(it_ameshk_n,:), highest a state val')
|
| | 472 | disp('Hap = mt_pol_a_cur(it_ameshk_n,:), highest a state choice')
|
| | 473 | disp('mak = mt_pol_k_cur(it_ameshk_n,:), highest k state choice')
|
| | 474 | disp(tb_valpol_iter);
|
| | 475 | end
|
| | 476 |
|
| | 477 | % Continuation Conditions:
|
| | 478 | % 1. if value function convergence criteria reached
|
| | 479 | % 2. if policy function variation over iterations is less than
|
| | 480 | % threshold
|
< 0.001 | 135 | 481 | if (it_iter == (it_maxiter_val + 1))
|
< 0.001 | 1 | 482 | bl_vfi_continue = false;
|
0.002 | 134 | 483 | elseif ((it_iter == it_maxiter_val) || ...
|
| 134 | 484 | (ar_val_diff_norm(it_iter) < fl_tol_val) || ...
|
| 134 | 485 | (sum(ar_pol_diff_norm(max(1, it_iter-it_tol_pol_nochange):it_iter)) < fl_tol_pol))
|
| | 486 | % Fix to max, run again to save results if needed
|
< 0.001 | 1 | 487 | it_iter_last = it_iter;
|
< 0.001 | 1 | 488 | it_iter = it_maxiter_val;
|
< 0.001 | 1 | 489 | end
|
| | 490 |
|
0.001 | 135 | 491 | end
|
| | 492 |
|
| | 493 | %% Process Optimal Choices 1: Formal and Informal Choices
|
| | 494 |
|
< 0.001 | 1 | 495 | result_map = containers.Map('KeyType','char', 'ValueType','any');
|
< 0.001 | 1 | 496 | result_map('mt_val') = mt_val;
|
< 0.001 | 1 | 497 | result_map('mt_pol_idx') = mt_pol_idx;
|
| | 498 |
|
| | 499 | % Find optimal Formal Informal Choices. Could have saved earlier, but was
|
| | 500 | % wasteful of resources
|
< 0.001 | 1 | 501 | for it_z_i = 1:length(ar_z)
|
< 0.001 | 15 | 502 | for it_coh_interp_j = 1:length(ar_interp_coh_grid)
|
| | 503 |
|
< 0.001 | 11580 | 504 | fl_coh = mt_interp_coh_grid_mesh_z(it_coh_interp_j, it_z_i);
|
< 0.001 | 11580 | 505 | fl_a_opti = mt_pol_a(it_coh_interp_j, it_z_i);
|
| | 506 |
|
| | 507 | % call formal and informal function.
|
1.262 | 11580 | 508 | [fl_max_c, fl_opti_b_bridge, fl_opti_inf_borr_nobridge, fl_opti_for_borr, fl_opti_for_save] = ...
|
| 11580 | 509 | ffs_fibs_min_c_cost_bridge(fl_a_opti, fl_coh, param_map, support_map, armt_map, func_map);
|
| | 510 |
|
| | 511 | % store savings and borrowing formal and inf optimal choices
|
< 0.001 | 11580 | 512 | mt_pol_b_with_r(it_coh_interp_j,it_z_i) = fl_max_c;
|
< 0.001 | 11580 | 513 | mt_pol_b_bridge(it_coh_interp_j,it_z_i) = fl_opti_b_bridge;
|
< 0.001 | 11580 | 514 | mt_pol_inf_borr_nobridge(it_coh_interp_j,it_z_i) = fl_opti_inf_borr_nobridge;
|
< 0.001 | 11580 | 515 | mt_pol_for_borr(it_coh_interp_j,it_z_i) = fl_opti_for_borr;
|
< 0.001 | 11580 | 516 | mt_pol_for_save(it_coh_interp_j,it_z_i) = fl_opti_for_save;
|
| | 517 |
|
0.001 | 11580 | 518 | end
|
< 0.001 | 15 | 519 | end
|
| | 520 |
|
| | 521 | %% Process Optimal Choices 2: Store a, k, c, coh Results
|
| | 522 | %
|
| | 523 | % # *mt_interp_coh_grid_mesh_z*: Cash-on-hand period _t_.
|
| | 524 | % # *mt_pol_a*: Safe asset choice, principles only for ipwkbz_fibs
|
| | 525 | % # *cl_mt_pol_a_principleonly*: mt_pol_a is stored in
|
| | 526 | % cl_mt_pol_a_principle only. This is a shortcut because we need to keep
|
| | 527 | % cl_mt_pol_a for mt_pol_b_with_r for the _ds_ code.
|
| | 528 | % # *cl_mt_pol_a*: stores _mt_pol_b_with_r_ which has principles and
|
| | 529 | % interest rates, to be used with _ds_ code.
|
| | 530 | % # *mt_pol_a*: Safe asset choice, principles only for ipwkbz_fibs
|
| | 531 | % # *cl_mt_pol_k*: Risky asset choice, principles only for ipwkbz_fibs
|
| | 532 | % # *cl_mt_pol_c*: Consumption in _t_ given choices.
|
| | 533 | % # *cl_pol_b_with_r*: Consumption cost of _mt_pol_a_ in _t+1_, given the
|
| | 534 | % formal and informal choices that are optimal to minimize this consumption
|
| | 535 | % cost.
|
| | 536 | %
|
| | 537 |
|
< 0.001 | 1 | 538 | result_map('cl_mt_coh') = {mt_interp_coh_grid_mesh_z, zeros(1)};
|
< 0.001 | 1 | 539 | result_map('cl_mt_pol_k') = {mt_pol_k, zeros(1)};
|
0.001 | 1 | 540 | result_map('cl_mt_pol_c') = {f_cons(mt_interp_coh_grid_mesh_z, mt_pol_a, mt_pol_k), zeros(1)};
|
| | 541 |
|
< 0.001 | 1 | 542 | result_map('cl_mt_pol_a') = {mt_pol_b_with_r, zeros(1)};
|
< 0.001 | 1 | 543 | result_map('cl_mt_pol_a_principleonly') = {mt_pol_a, zeros(1)};
|
| | 544 |
|
| | 545 | %% Process Optimal Choices 3: Store Formal and Informal Choices
|
< 0.001 | 1 | 546 | result_map('cl_mt_pol_b_bridge') = {mt_pol_b_bridge, zeros(1)};
|
< 0.001 | 1 | 547 | result_map('cl_mt_pol_inf_borr_nobridge') = {mt_pol_inf_borr_nobridge, zeros(1)};
|
< 0.001 | 1 | 548 | result_map('cl_mt_pol_for_borr') = {mt_pol_for_borr, zeros(1)};
|
< 0.001 | 1 | 549 | result_map('cl_mt_pol_for_save') = {mt_pol_for_save, zeros(1)};
|
| | 550 |
|
| | 551 | %% Process Optimal Choices 4: List of Variable Names to be processed by distributional codes
|
| | 552 | % this list is needed for the ds codes to generate distribution,
|
| | 553 | % distributional statistcs will be computed for elements in the list here.
|
| | 554 |
|
< 0.001 | 1 | 555 | result_map('ar_st_pol_names') = ...
|
| | 556 | ["cl_mt_coh", "cl_mt_pol_a", "cl_mt_pol_k", "cl_mt_pol_c", "cl_mt_pol_a_principleonly", ...
|
| | 557 | "cl_mt_pol_b_bridge", "cl_mt_pol_inf_borr_nobridge", "cl_mt_pol_for_borr", "cl_mt_pol_for_save"];
|
| | 558 |
|
| | 559 | % Get Discrete Choice Outcomes
|
0.004 | 1 | 560 | result_map = ffs_fibs_identify_discrete(result_map, bl_input_override);
|
| | 561 |
|
| | 562 | %% End Timer and Profile
|
| | 563 |
|
| | 564 | % End Timer
|
< 0.001 | 1 | 565 | if (bl_time)
|
< 0.001 | 1 | 566 | toc;
|
< 0.001 | 1 | 567 | end
|
| | 568 |
|
| | 569 | % End Profile
|
< 0.001 | 1 | 570 | if (bl_profile)
|
0.004 | 1 | 571 | profile off
|
| | 572 | profile viewer
|
| | 573 | st_file_name = [st_profile_prefix st_profile_name_main st_profile_suffix];
|
| | 574 | profsave(profile('info'), strcat(st_profile_path, st_file_name));
|
| | 575 | end
|
| | 576 |
|
| | 577 | %% Post Solution Graph and Table Generation
|
| | 578 |
|
| | 579 | if (bl_post)
|
| | 580 | bl_input_override = true;
|
| | 581 | result_map('ar_val_diff_norm') = ar_val_diff_norm(1:it_iter_last);
|
| | 582 | result_map('ar_pol_diff_norm') = ar_pol_diff_norm(1:it_iter_last);
|
| | 583 | result_map('mt_pol_perc_change') = mt_pol_perc_change(1:it_iter_last, :);
|
| | 584 |
|
| | 585 | armt_map('mt_coh_wkb_ori') = mt_coh_wkb;
|
| | 586 | armt_map('ar_a_meshk_ori') = ar_a_meshk;
|
| | 587 | armt_map('ar_k_mesha_ori') = ar_k_mesha;
|
| | 588 |
|
| | 589 | armt_map('mt_coh_wkb') = mt_interp_coh_grid_mesh_z;
|
| | 590 | armt_map('it_ameshk_n') = length(ar_interp_coh_grid);
|
| | 591 | armt_map('ar_a_meshk') = mt_interp_coh_grid_mesh_z(:,1);
|
| | 592 | armt_map('ar_k_mesha') = zeros(size(mt_interp_coh_grid_mesh_z(:,1)) + 0);
|
| | 593 |
|
| | 594 | % Standard AZ graphs
|
| | 595 | result_map = ff_akz_vf_post(param_map, support_map, armt_map, func_map, result_map, bl_input_override);
|
| | 596 |
|
| | 597 | % Graphs for results_map with FIBS contents
|
| | 598 | armt_map('ar_a') = ar_interp_coh_grid;
|
| | 599 | result_map = ff_az_fibs_vf_post(param_map, support_map, armt_map, func_map, result_map, bl_input_override);
|
| | 600 |
|
| | 601 | end
|
| | 602 |
|
| | 603 | %% Display Various Containers
|
| | 604 |
|
| | 605 | if (bl_display_defparam)
|
| | 606 |
|
| | 607 | %% Display 1 support_map
|
| | 608 | fft_container_map_display(support_map, it_display_summmat_rowmax, it_display_summmat_colmax);
|
| | 609 |
|
| | 610 | %% Display 2 armt_map
|
| | 611 | fft_container_map_display(armt_map, it_display_summmat_rowmax, it_display_summmat_colmax);
|
| | 612 |
|
| | 613 | %% Display 3 param_map
|
| | 614 | fft_container_map_display(param_map, it_display_summmat_rowmax, it_display_summmat_colmax);
|
| | 615 |
|
| | 616 | %% Display 4 func_map
|
| | 617 | fft_container_map_display(func_map, it_display_summmat_rowmax, it_display_summmat_colmax);
|
| | 618 |
|
| | 619 | %% Display 5 result_map
|
| | 620 | fft_container_map_display(result_map, it_display_summmat_rowmax, it_display_summmat_colmax);
|
| | 621 |
|
| | 622 | end
|
| | 623 |
|
| | 624 | end
|
Other subfunctions in this file are not included in this listing.