# HG changeset patch
# User sh@sh-laptop
# Date 1208369999 14400
# Node ID 83ea845cda36586912c35a704fc2727ca988d0dd
# Parent  050f695c3a7807fa9b2430675aad26e983fc958a
Display a (hopefully) informative error message if gnuplot isn't found

diff -r 050f695c3a78 -r 83ea845cda36 scripts/ChangeLog
--- a/scripts/ChangeLog	Tue Apr 15 16:31:28 2008 -0400
+++ b/scripts/ChangeLog	Wed Apr 16 14:19:59 2008 -0400
@@ -1,3 +1,7 @@
+2008-04-16  Soren Hauberg  <hauberg@gmail.com>
+
+	* plot/__gnuplot_version__.m: Display error if gnuplot is not found.
+
 2008-04-15  John W. Eaton  <jwe@octave.org>
 
 	* plot/view.m: Get values from current axes if nargin == 0.
diff -r 050f695c3a78 -r 83ea845cda36 scripts/plot/__gnuplot_version__.m
--- a/scripts/plot/__gnuplot_version__.m	Tue Apr 15 16:31:28 2008 -0400
+++ b/scripts/plot/__gnuplot_version__.m	Wed Apr 16 14:19:59 2008 -0400
@@ -28,6 +28,9 @@
 
   if (isempty (__version__))
     [status, output] = system (sprintf ("%s --version", gnuplot_binary ()));
+    if (status != 0)
+      error ("you must have gnuplot installed to display graphics; if you have gnuplot installed in a non-standard location, see the 'gnuplot_binary' function");
+    endif
     pattern = "^[^\\s]*\\s*([0-9]+\\.[0-9]+)\\s*[^\\s]*\\s*([^\\s]*)";
     [d1, d2, d3, d4, matches] = regexp (output, pattern);
     if (iscell (matches) && numel (matches) > 0 && iscellstr (matches{1}))