# HG changeset patch
# User Thomas Weber <address@hidden>
# Date 1265101668 -3600
# Node ID 4f93c55f6382906a7cdddff35a5b72b1c957bab2
# Parent  4ea0bda308b7e79bcc69eb7b7703a2151843abee
Add test case for empty argument in filter()

diff --git a/src/DLD-FUNCTIONS/filter.cc b/src/DLD-FUNCTIONS/filter.cc
--- a/src/DLD-FUNCTIONS/filter.cc
+++ b/src/DLD-FUNCTIONS/filter.cc
@@ -735,6 +735,12 @@
 %!  y0 = zeros(4,4,2); y0(1:2,1:4,1) = +1; y0(1:2,1:4,2) = -1;
 %!  y = filter(b, [1], x);
 %!  assert(all(all(all(y==y0))))
+%!
+%!test % test for empty X
+%! a = 1; b = ones(10,1)/10; 
+%! result = filter(b,a,[]);
+%! expected = [];
+%! assert(result, expected);
 
 %%  Should put some tests of the "DIM" parameter in here.