From c4e1b8ef80c679e49dfea8253a180032b19e89ac Mon Sep 17 00:00:00 2001
From: sebastien <sebastien@ac1d8469-bf42-47a9-8791-bf33cf982152>
Date: Fri, 17 Apr 2009 21:22:44 +0000
Subject: [PATCH] trunk preprocessor: fixed bug with normcdf derivative
 (introduced in r2596)

git-svn-id: https://www.dynare.org/svn/dynare/trunk@2598 ac1d8469-bf42-47a9-8791-bf33cf982152
---
 preprocessor/ExprNode.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/preprocessor/ExprNode.cc b/preprocessor/ExprNode.cc
index 56ac48cda..a8e5a3a08 100644
--- a/preprocessor/ExprNode.cc
+++ b/preprocessor/ExprNode.cc
@@ -1541,7 +1541,7 @@ TrinaryOpNode::computeDerivative(int deriv_id)
       // -(x-mu)^2/sigma^2
       t13 = datatree.AddUMinus(t12);
       // -((x-mu)^2/sigma^2)/2
-      t12 = datatree.AddDivide(t13,t11);
+      t12 = datatree.AddDivide(t13, datatree.Two);
       // exp(-((x-mu)^2/sigma^2)/2)
       t13 = datatree.AddExp(t12);
       // derivative of a standardized normal