Re: help with legend

[Ben Abbott]

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