From f97c1386857969791bebf27193537f738d947aa3 Mon Sep 17 00:00:00 2001
From: Johannes Pfeifer <jpfeifer@gmx.de>
Date: Thu, 27 May 2021 22:35:33 +0200
Subject: [PATCH] sim1_purely_backward.m: for purely static model, do not use
past value for first iteration
Index 0 does not exist.
---
matlab/perfect-foresight-models/sim1_purely_backward.m | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/matlab/perfect-foresight-models/sim1_purely_backward.m b/matlab/perfect-foresight-models/sim1_purely_backward.m
index daee720cea..3f155325f2 100644
--- a/matlab/perfect-foresight-models/sim1_purely_backward.m
+++ b/matlab/perfect-foresight-models/sim1_purely_backward.m
@@ -43,8 +43,13 @@ dynamicmodel_s = str2func('dynamic_backward_model_for_simulation');
info.status = true;
for it = M.maximum_lag + (1:options.periods)
- y = endogenousvariables(:,it-1); % Values at previous period, also used as guess value for current period
- ylag = y(iyb);
+ if M.maximum_lag==0 && it==1
+ y = endogenousvariables(:,it); % Values at previous period, also used as guess value for current period
+ ylag = [];
+ else
+ y = endogenousvariables(:,it-1); % Values at previous period, also used as guess value for current period
+ ylag = y(iyb);
+ end
if ismember(options.solve_algo, [12,14])
[tmp, check] = dynare_solve(dynamicmodel_s, y, options, M.isloggedlhs, M.isauxdiffloggedrhs, M.endo_names, M.lhs, ...
dynamicmodel, ylag, exogenousvariables, M.params, steadystate, it);
--
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