From 7b1c61f63c670605e682fcb0b132c1766baebe7e Mon Sep 17 00:00:00 2001
From: Houtan Bastani <houtan@dynare.org>
Date: Thu, 21 Nov 2019 20:10:39 +0100
Subject: [PATCH] allow `sur` to be run from the Matlab prompt

---
 matlab/ols/sur.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/matlab/ols/sur.m b/matlab/ols/sur.m
index 8502525a6..08783aeda 100644
--- a/matlab/ols/sur.m
+++ b/matlab/ols/sur.m
@@ -109,7 +109,7 @@ end
 
 %% Return to surgibbs if called from there
 st = dbstack(1);
-if strcmp(st(1).name, 'surgibbs')
+if ~isempty(st) && strcmp(st(1).name, 'surgibbs')
     varargout{1} = nobs;
     varargout{2} = X{param_names{:}}.data;
     varargout{3} = Y.data;