[Octave-bug-tracker] [bug #39393] plotyy log scale results in linear ticks

[Ronald]

URL:
  <http://savannah.gnu.org/bugs/?39393>

                 Summary: plotyy log scale results in linear ticks
                 Project: GNU Octave
            Submitted by: revdmeer
            Submitted on: Tue 02 Jul 2013 07:02:41 GMT
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.4
        Operating System: Any

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Details:

By default a plotyy results in linear axes. This can be changed to logarithmic
e.g. with:

set(ax,'XScale','log');

In the fltk backend the ticks will remain linear instead of logarithmic. In
the gnuplot backend the visual result is correct. However when getting the
XTick values from the axis with e.g.:

get(ax(1),'XTick')

... still gives the linear values, instead of the logarithmic values.

To reproduce with the fltk backend:

graphics_toolkit fltk
figure
[ax, h1, h2]=plotyy(1:100,1:100,1:100,(1:100)/2)
set(ax(1),'XScale','log');
set(ax(2),'XScale','log');

The XTick position are now linear, but they should be logarithmic.

To reproduce with the gnuplot backend:

graphics_toolkit gnuplot
figure
[ax, h1, h2]=plotyy(1:100,1:100,1:100,(1:100)/2)
set(ax(1),'XScale','log');
set(ax(2),'XScale','log');
get(ax(1),'XTick')
ans =

     0    20    40    60    80   100
get(ax(1),'XTickLabel')
ans = 
{
  [1,1] = 0
  [1,2] = 20
  [1,3] = 40
  [1,4] = 60
  [1,5] = 80
  [1,6] = 100
}

Now the plot is visually correct, with XTick labels at 1, 10 and 100. However
answer from the above get commands still incorrect.




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