[Octave-bug-tracker] [bug #48115] __plotyy__ function bug when using FUN2 argument

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?48115>

                 Summary: __plotyy__ function bug when using FUN2 argument
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fr 03 Jun 2016 15:36:06 UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: Holger Strubelt
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.1
        Operating System: Any

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Details:

When using a user function (e.g. anonymous function) for the secondary axes
used by plotyy, a matrix index error is created.
The bug is in line 134 of function file plotyy.m within function __plotyy__:

h2 = feval (fun2, ax(2), x2, y2);

The second argument ax(2) must be deleted since fun2 is evaluated on the
current axes, which is set to ax(2) before that line.
I've attached a corrected version of plotyy.m.

In addition to said bug, I've added an improvement concerning coloring of the
y-axes. This doesn't make sense if one of the plot contains multiple lines
with different colors, since only the last line will control the y-axis color.
So I added a check for the number of lines within the plot:
For axis 1:

  set (ax(1), "color", "none", "xlim", xlim);
  if length(h1) == 1 ## Coloring y-axis only makes sense if plot contains
exactly one related line
    set (ax(1), "ycolor", getcolor (h1(1)));
  endif


For axis 2:

  set (ax(2), "yaxislocation", "right", "color", "none", "box", "off", "xlim",
xlim);
  if length(h2) == 1 ## Coloring y-axis only makes sense if plot contains
exactly one related line
    set (ax(2), "ycolor", getcolor (h2(1)));
  endif


If the maintainer team doesn't follow my argument in this matter, please feel
free not to include this change into a new version of plotyy.m.



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File Attachments:


-------------------------------------------------------
Date: Fr 03 Jun 2016 15:36:06 UTC  Name: plotyy.m  Size: 10kB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=37377>

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