Re: Subplots with Gnuplot: Two y-axes?

[Ben Abbott]

> On Aug 25, 2015, at 7:14 AM, Tatsuro MATSUOKA <address@hidden> wrote:
> 
> ----- Original Message -----
> 
>> From: Martin Kunz 
>> To: help-octave
>> Cc: 
>> Date: 2015/8/25, Tue 18:36
>> Subject: Subplots with Gnuplot: Two y-axes?
>> 
>> Hi,
>> 
>> I would like to create a column of three subplots where the second plot
>> has its y-axis on the right-hand side. Example code:
>> 
>> graphics_toolkit ("gnuplot");
>> 
>> figure(1)
>> clf;
>> hAx(1) = subplot(3,1,1);
>> plot(5,5);
>> hAx(2) = subplot(3,1,2);
>> plot(10:-1:1);
>> hAx(3) = subplot(3,1,3);
>> plot(10:20)
>> set(hAx(2),"yaxislocation","right")
>> 
>> For some reason the third plot has a correct y-axis on the left side,
>> but additionally the y-axis of the second plot on the right (see
>> attached screenshot). Scrolling in the third subplot vertically moves
>> both y-axes, so they seem to belong to one axis object, not two on top
>> of each other.
>> I cannot even find the duplicate yticklabels:
>> 
>>>> get (1,"children")
>> ans =
>> 
>>   -201.90
>>   -207.46
>>   -213.86
>> 鉢>> get(get(1,"children")(1),"yticklabel")
>> ans =
>> {
>>   [1,1] = 10
>>   [1,2] = 12
>>   [1,3] = 14
>>   [1,4] = 16
>>   [1,5] = 18
>>   [1,6] = 20
>> }
>> 
>> (Note that the first child of the figure is the lowest axis object)
>> 
>> Is this a bug in Gnuplot? Do you have any ideas for a workaround?
>> 
>> I am using Octave 3.0.0-rc4 under Windows 7 with the bundled Gnuplot 4.6
>> binary.
>> Thanks for any help!
>> Martin
> 
> 
> I have execute the commandon qt and fltk graphics toolkit. 
> Subplots work as expected.
> I do not know that this is gnuplot a bug or an error in octave handling of 
> gnuplot.
> 
> Workaround is to use qt or fltk graphics toolkit.
> 
> 
> BTW, "Octave 3.0.0-rc4 under Windows 7"=> perhaps Octave 4.0.0-rc4? right ?
> 
> 
> Tatsuro

I can confirm that the example works as it should when using an OpenGL toolkit 
and works are Martin reported when using Gnuplot.

Martin, would you file a bug report?

https://savannah.gnu.org/bugs/?group=octave

Ben