From 7c9f272e157a6505d88e744046f94dcb00468ec5 Mon Sep 17 00:00:00 2001
From: Houtan Bastani <houtan@dynare.org>
Date: Tue, 5 Mar 2019 12:42:37 +0100
Subject: [PATCH] always substitute diffs of expressions that contain leads.
closes #21
---
src/DataTree.cc | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/DataTree.cc b/src/DataTree.cc
index 7a60c67d..84b0faaf 100644
--- a/src/DataTree.cc
+++ b/src/DataTree.cc
@@ -336,6 +336,9 @@ DataTree::AddPowerDeriv(expr_t iArg1, expr_t iArg2, int powerDerivOrder)
expr_t
DataTree::AddDiff(expr_t iArg1)
{
+ if (iArg1->maxLead() > 0)
+ // Issue #21: always substitute diffs with lags
+ return AddMinus(iArg1, iArg1->decreaseLeadsLags(1));
return AddUnaryOp(UnaryOpcode::diff, iArg1);
}
--
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