Add a missing include

diff --git a/source/linal/matrixops.h b/source/linal/matrixops.h
index 790dfbfaf694724f6040555077b56e920ff0c4f3..5bf9f433150fb111d77296508746a488625ef1e8 100644 (file)
--- a/source/linal/matrixops.h
+++ b/source/linal/matrixops.h
@@ -3,6 +3,7 @@
 
 #include <cmath>
 #include <stdexcept>
+#include <string>
 
 namespace Msp {
 namespace LinAl {