From 114754d15ba7d5d089620e13e87a90b9c80a6da0 Mon Sep 17 00:00:00 2001
From: John Forrest <jjhforrest@gmail.com>
Date: Wed, 26 Jun 2024 15:35:16 +0100
Subject: [PATCH] make modifyCoefficient a bit safer

---
 src/ClpModel.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ClpModel.hpp b/src/ClpModel.hpp
index 6115e18e..cbc6007d 100644
--- a/src/ClpModel.hpp
+++ b/src/ClpModel.hpp
@@ -247,6 +247,8 @@ class CLPLIB_EXPORT ClpModel {
     bool keepZero = false)
   {
     matrix_->modifyCoefficient(row, column, newElement, keepZero);
+    // Say matrix changed
+    whatsChanged_ &= ~15;
   }
   /** Change row lower bounds */
   void chgRowLower(const double *rowLower);