From 7a758f6779e9665d1d0bdb5fb7191af3cccbc5cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Villemot?= <sebastien@dynare.org>
Date: Mon, 28 Apr 2025 16:50:06 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Fix=20linearity=20check=20for=20?=
=?UTF-8?q?Ramsey=20models=20with=20lead/lag>1=20on=20endos=20or=20>0=20on?=
=?UTF-8?q?=20exos?=
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Ref. dynare#1960
---
src/ModelEquationBlock.hh | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/src/ModelEquationBlock.hh b/src/ModelEquationBlock.hh
index 9b943b24..e5e7bddc 100644
--- a/src/ModelEquationBlock.hh
+++ b/src/ModelEquationBlock.hh
@@ -1,5 +1,5 @@
/*
- * Copyright © 2010-2024 Dynare Team
+ * Copyright © 2010-2025 Dynare Team
*
* This file is part of Dynare.
*
@@ -62,6 +62,17 @@ protected:
{
return "original Ramsey model";
}
+ int
+ getJacobianCol(int deriv_id, [[maybe_unused]] bool sparse) const override
+ {
+ /* Override the DynamicModel method by returning a dummy Jacobian column number.
+ The override is necessary because the method from DynamicModel fails with
+ endos with lag/lead greater than 1 or exos with a lag/lead, while substitutions
+ are by definition not done for an original model.
+ In particular, this fixes dynare#1960 (equation derivatives are computed for models declared
+ as linear, to check whether they are truly linear). */
+ return deriv_id;
+ }
};
class SteadyStateModel : public DataTree
--
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