From c81ca04b165501b59798c998c8c1d271ada86df8 Mon Sep 17 00:00:00 2001
From: Michael Cook <code@mdcook.net>
Date: Thu, 17 Dec 2020 00:38:25 -0800
Subject: [PATCH] Sanity check error on SwapRows (#156)

---
 matrix.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/matrix.go b/matrix.go
index a6b9730..22669c2 100644
--- a/matrix.go
+++ b/matrix.go
@@ -218,7 +218,10 @@ func (m matrix) gaussianElimination() error {
 		if m[r][r] == 0 {
 			for rowBelow := r + 1; rowBelow < rows; rowBelow++ {
 				if m[rowBelow][r] != 0 {
-					m.SwapRows(r, rowBelow)
+					err := m.SwapRows(r, rowBelow)
+					if err != nil {
+						return err
+					}
 					break
 				}
 			}