# HG changeset patch
# User bpabbott
# Date 1374332184 14400
# Node ID 13a12d01aca5e399daecbe3cdf2951995ebb0278
# Parent  ddc62f0c7a35a1d21c501827e0616c3c1cc626db
Avoid tight limits having a span of zero.

script/plot/axis.m: For the "tight" option, avoid a span of zero.
(Bug # 39429)

diff -r ddc62f0c7a35 -r 13a12d01aca5 scripts/plot/axis.m
--- a/scripts/plot/axis.m	Sat Jul 20 09:06:50 2013 -0400
+++ b/scripts/plot/axis.m	Sat Jul 20 10:56:24 2013 -0400
@@ -344,16 +344,31 @@
 
 function __do_tight_option__ (ca)
 
-  set (ca,
-       "xlim", __get_tight_lims__ (ca, "x"),
-       "ylim", __get_tight_lims__ (ca, "y"));
+  xlim = __get_tight_lims__ (ca, "x");
+  if (all (xlim == 0))
+    xlim = eps () * [-1 1];
+  elseif (diff (xlim == 0))
+    xlim = xlim .* (1 + eps () * [-1, 1]);
+  endif
+  ylim = __get_tight_lims__ (ca, "y");
+  if (all (ylim == 0))
+    ylim = eps () * [-1 1];
+  elseif (diff (ylim == 0))
+    ylim = ylim .* (1 + eps () * [-1, 1]);
+  endif
+  set (ca, "xlim", xlim, "ylim", ylim)
   if (__calc_dimensions__ (ca) > 2)
-    set (ca, "zlim", __get_tight_lims__ (ca, "z"));
+    zlim = __get_tight_lims__ (ca, "z");
+    if (all (zlim == 0))
+      zlim = eps () * [-1 1];
+    elseif (diff (zlim == 0))
+      zlim = zlim .* (1 + eps () * [-1, 1]);
+    endif
+    set (ca, "zlim", zlim);
   endif
 
 endfunction
 
-
 %!demo
 %! clf;
 %! t = 0:0.01:2*pi;