# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh@octave.org>
# Date 1408829936 14400
# Node ID 920a400929ca9e385f06d36e2d3fcc33a9f656af
# Parent  4c59f69fa52c034c9bae58198c8ed08260e41815
* isprime.m: Return an empty array for empty input

diff -r 4c59f69fa52c -r 920a400929ca scripts/specfun/isprime.m
--- a/scripts/specfun/isprime.m	Sat Aug 23 16:12:03 2014 +0200
+++ b/scripts/specfun/isprime.m	Sat Aug 23 17:38:56 2014 -0400
@@ -43,6 +43,11 @@
     error ("isprime: X must be a non-negative integer");
   endif
 
+  if (isempty (x))
+    t = x;
+    return;
+  endif
+
   maxn = max (x(:));
   ## generate prime table of suitable length.
   maxp = min (maxn, max (sqrt (maxn), 1e7)); # FIXME: threshold not optimized.