# HG changeset patch
# User Rik <rik@octave.org>
# Date 1377101291 25200
# Node ID 4c7ee36f591d3835aab3ff43eb501a4b45c960f1
# Parent  8520c264619ccc9456134ea960594f650318b045
__errplot__.m: Fix bug with loglogerr and negative y values (bug #39837).

* scripts/plot/private/__errplot__.m: If data values are all negative, take
the absolute value before using log to calculate data range.

diff -r 8520c264619c -r 4c7ee36f591d scripts/plot/private/__errplot__.m
--- a/scripts/plot/private/__errplot__.m	Tue Aug 20 22:42:38 2013 -0700
+++ b/scripts/plot/private/__errplot__.m	Wed Aug 21 09:08:11 2013 -0700
@@ -228,7 +228,11 @@
     xhi = xdata + dx;
   else
     n = xdata > 0;
-    rx = exp (0.01 * (max (log (xdata(n))) - min (log (xdata(n)))));
+    if (! any (n))
+      n = xdata < 0;
+    endif
+    logdata = log (abs (xdata(n)));
+    rx = exp (0.01 * (max (logdata) - min (logdata)));
     xlo = xdata/rx;
     xhi = xdata*rx;
   endif
@@ -238,7 +242,11 @@
     yhi = ydata + dy;
   else
     n = ydata > 0;
-    ry = exp (0.01 * (max (log (ydata(n))) - min (log (ydata(n)))));
+    if (! any (n))
+      n = ydata < 0;
+    endif
+    logdata = log (abs (ydata(n)));
+    ry = exp (0.01 * (max (logdata) - min (logdata)));
     ylo = ydata/ry;
     yhi = ydata*ry;
   endif