Re: help with legend

[Valmor de Almeida]

On 01/16/2012 08:24 AM, Ben Abbott wrote:
> On Jan 15, 2012, at 9:58 PM, Valmor de Almeida wrote:
> 
>> On 01/15/2012 08:10 PM, Ben Abbott wrote:
>>>
>>> On Jan 15, 2012, at 2:35 PM, Ben Abbott wrote:
>>>
>>>> On Jan 15, 2012, at 12:48 PM, Valmor de Almeida wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I am trying to customize legends on a plotyy axes/lines but I am not
>>>>> able to. Here are the commands:
>>>>>
>>>>> [ax, h1, h2] = plotyy(x1,y1, x2,y2, @plot, @plot);
>>>>>
>>>>> legend(h1,y1Label,"location",'south',"fontname",'Helvetica');
>>>>>
>>>>> legend(h2,y2Label,"location",'northeast',"fontname",'Helvetica');
>>>>>
>>>>> Only the first legend shows up and the font is Courier which I am unable
>>>>> to change. Also the text in the legend precedes the key which I would
>>>>> like to invert using 'right' but it does not work either.
>>>>>
>>>>> I am using octave-3.4.0. Would anyone have an example?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> --
>>>>> Valmor
>>>>>
>>>>> PS: In the above command I also tried legend(ax(1),...) and it does not
>>>>> make a difference.
>>>>
>>>> Octave tries to duplicate Matlab's implementation of plotyy and legend. 
>>>>
>>>>    x1 = 0:5:10;
>>>>    x2 = 0:10;
>>>>    y1 = rand (size (x1));
>>>>    y2 = rand (size (x2));
>>>>    [ax, h1, h2] = plotyy (x1, y1, x2, y2, @plot, @plot);
>>>>    y1Label = "y1";
>>>>    y2Label = "y2";
>>>>
>>>> The command below should produce the desired legend (please check, the 
>>>> implementation may have changed since 3.4.0).
>>>>
>>>>    legend ([h1, h2], {y1Label, y2Label}, "location", "south")
>>>>
>>>> The commands below should also work, but currently reverse the legend 
>>>> entries.
>>>>
>>>>    legend ({y1Label, y2Label}, "location", "south")
>>>>
>>>>    legend (y1Label, y2Label, "location", "south");
>>>>
>>>> I've entered a bug report in the tracker.
>>>>
>>>>    https://savannah.gnu.org/bugs/?35314
>>>>
>>>> Regarding "Fontsize", the legend function doesn't accept property 
>>>> names/values as input.
>>>>
>>>> To change the fontname, the legend command returns the handle to the 
>>>> legend. You can change its fontname property directly.
>>>>
>>>>    h = legend ([h1, h2], {y1Label, y2Label}, "location", "south")
>>>>    set (h, "fontname",'Helvetica") 
>>>>
>>>> Ben
>>>
>>> I've attached a changeset to the bug-tracker that fixes the legend command 
>>> so that all three versions below work the same.
>>>
>>>     legend ([h1, h2], {y1Label, y2Label}, "location", "south")
>>>
>>>     legend ({y1Label, y2Label}, "location", "south")
>>>
>>>     legend (y1Label, y2Label, "location", "south");
>>>
>>> The tracker link is below.
>>>
>>>     https://savannah.gnu.org/bugs/index.php?35314
>>>
>>> Ben
>>>
>>
>> Thanks Ben,
>>
>> None of the forms work for my version 3.4.0.
>>
>> error:   /usr/share/octave/3.4.0/m/plot/__gnuplot_print__.m at line 170,
>> column 5
>>
>> The handle to set the fontname does not work either. Which version are
>> you using? 3.4.3 is the highest I will be able to go unless I compile
>> octave myself.
>>
>> --
>> Valmor
> 
> 
> The error from __gnplot_print__() is something different. That function only 
> is called by print().
> 
> Running 3.4.0, I checked ...
> 
>       x = 0:10;
>       plotyy (x, sqrt(x), x, x.^2);
>       h = legend ("root", "squared");
>       set (h, "fontname", "Courier")
>       print test.eps
>       print test.png
> 
> ... I encountered no errors, and obtained the expected results.
> 
> Can you provide a simple example that produces the __gnuplot_print__ error ?
> 
> Ben

Hello Ben,

Tried your example above and got

octave:3> h = legend("root", "squared");
error: structure has no member `fontname'
error: evaluating argument list element number 1
error: called from:
error:   /usr/share/octave/3.4.0/m/plot/__go_draw_axes__.m at line 2086,
column 3
error:   /usr/share/octave/3.4.0/m/plot/__go_draw_axes__.m at line 1475,
column 31
error:   /usr/share/octave/3.4.0/m/plot/__go_draw_figure__.m at line
119, column 21
error:   /usr/share/octave/3.4.0/m/plot/__gnuplot_drawnow__.m at line
86, column 5

Thanks for inputs.

--
Valmor
> 
> 
> 
>