[Octave-bug-tracker] [bug #44829] Multiple legends not working anymore with plotyy

[Mattias Linde]

URL:
  <http://savannah.gnu.org/bugs/?44829>

                 Summary: Multiple legends not working anymore with plotyy
                 Project: GNU Octave
            Submitted by: linde
            Submitted on: Tue 14 Apr 2015 08:15:11 AM GMT
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.1
        Operating System: GNU/Linux

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Details:


I have an old script that used to work in octave 3.2 which I've simplified as
far as possible:


figure(1);
clf
N = 10;
[ax,h1,h2] = plotyy( 1:N, rand(1,N), 1:N, rand(1,N), @plot, @plot );

axes(ax(1)) % Should not be needed
legend( ax(1), 'values1', 'Location', 'northwest');

axes(ax(2))
legend( ax(2), 'values2', 'Location', 'northeast');

set(ax(1), 'color', 'none')
set(ax(2), 'color', 'none')


Tested today with 3.2.4 and it works.

This no longer works in version 3.6.2 or 3.8.1 or the latest dev sources. 
The version I built this morning says 4.0.0-rc3

I only get one legend and not two as I expect. 

Did most testing in 3.8.1 and changing to gnuplot for toolkit instead of fltk
had no effect.

It does work in matlab 2014b.



As a workaround, I tried to create two axes myself instead of using plotyy and
do the same thing.
The second code snippet works in 3.6 and 3.8 as well as matlab. Have not
tested in 3.2.

Code:

figure(2);
clf
N = 10;
h1 = plot(1:N, rand(1,N), 'r');

a1 = gca();
a2 = axes();

h2 = plot(a2, 1:N, rand(1,N),'g');         

% I know I haven't positioned a2 to the right as the first example will do
automatically

legend(a1, 'first', 'Location', 'northwest');
legend(a2, 'second', 'Location', 'northeast')

set(a1, 'color', 'none')
set(a2, 'color', 'none')





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