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changeset 17304:4c7ee36f591d

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__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.
author Rik <rik@octave.org>
date Wed, 21 Aug 2013 09:08:11 -0700
parents 8520c264619c
children ab71b9829752
files scripts/plot/private/__errplot__.m
diffstat 1 files changed, 10 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- 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