From 7a4d56562f0ac2efd5dcf1d75c180f7d9ba495e6 Mon Sep 17 00:00:00 2001
From: Andrew Hart <ahart@cern.ch>
Date: Fri, 15 Mar 2024 15:06:36 +0100
Subject: [PATCH] Made unitMatrix the same size as matRinv.

---
 L1Trigger/TrackFindingTMTT/src/KFbase.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/L1Trigger/TrackFindingTMTT/src/KFbase.cc b/L1Trigger/TrackFindingTMTT/src/KFbase.cc
index c7e55f54adab9..afff3cbc7709c 100644
--- a/L1Trigger/TrackFindingTMTT/src/KFbase.cc
+++ b/L1Trigger/TrackFindingTMTT/src/KFbase.cc
@@ -551,7 +551,7 @@ namespace tmtt {
       matRinv = TMatrixD(TMatrixD::kInverted, matR);
     } else {
       // Protection against rare maths instability.
-      const TMatrixD unitMatrix(TMatrixD::kUnit, TMatrixD(nHelixPar_, nHelixPar_));
+      const TMatrixD unitMatrix(TMatrixD::kUnit, TMatrixD(2, 2));
       const double big = 9.9e9;
       matRinv = big * unitMatrix;
     }