Re: Differences between graphics_toolkits, greek letters

[Ben Abbott]

On Jan 19, 2012, at 2:04 PM, Ben Abbott wrote:

> On Jan 18, 2012, at 11:09 AM, Ben Abbott wrote:
> 
>> On Jan 18, 2012, at 10:03 AM, Walter White wrote:
>> 
>>> Hello,
>>> 
>>> I have some questions about the different graphics toolkits available in 
>>> Octave
>>> and hope that you can help me as I could not find any documentation on this 
>>> topic.
>>> (Octave 3.4.3, Windows 7)
>>> 
>>> Which toolkit is recommended to date? Where are the main differences?
>>> Is the support for gnuplot being dropped in the future?
>>> 
>>> Which toolkit provides more possibilities, in my case primary related to 
>>> printing figures to
>>> files, but also other common possibilities?
>>> 
>>> I ran the script attached below to examine the labelling of plots by 
>>> gnuplot and fltk
>>> and fltk does not print any greek letters. Is it possible?
>>> 
>>> Gnuplot does not support greek letters in the legend, do you know a
>>> way to achieve this?
>>> 
>>> Kind regards,
>>> Walter
>>> 
>>> -----------------------------------
>>> x = 1:10
>>> y = rand(10,1)
>>> 
>>> label_string = '\eta_{efficiency} \epsilon^{2} \lambda \lambda \circ \alpha'
>>> 
>>> graphics_toolkit('gnuplot')
>>> legend = sprintf('r-;%s;',label_string);
>>> plot(x,y,legend)
>>> 
>>> ylabel(label_string)
>>> xlabel(label_string)
>>> title(label_string)
>>> print_filename = sprintf('./test_gnuplot.png')
>>> print(print_filename, '-dpng','-FHelvetica:8','-S1024,768')
>>> close all
>>> 
>>> graphics_toolkit('fltk')
>>> 
>>> legend = sprintf('r-;%s;',label_string);
>>> plot(x,y,legend)
>>> 
>>> ylabel(label_string)
>>> xlabel(label_string)
>>> title(label_string)
>>> print_filename = sprintf('./test_fltk.png')
>>> print(print_filename, '-dpng','-FHelvetica:8','-S1024,768')
>>> close all
>> 
>> The gnuplot toolkit is still the default.
>> 
>> The "\circ" command is not supported by Octave. I use \circ in LaTeX quite 
>> often, but is \circ a valid "TeX" command ?
>> 
>> In any event, using the gnuplot toolkit with Octave-3.4.0 and with the 
>> current developers sources, the following works for me.
>> 
>>      x = 1:10
>>      y = rand(10,1)
>>      label_string = '\eta_{efficiency} \epsilon^{2} \lambda \lambda \alpha'
>>      plot (x, y)
>>      legend (label_string)
>>      ylabel(label_string)
>>      xlabel(label_string)
>>      title(label_string)
>> 
>> Something is wrong with the implementation for the syntax below.
>> 
>>      plot (x, y, sprintf (";%s;", label_string))
>> 
>> A bug report needs to be filed. But that will have to wait until after the 
>> blackout.
>> 
>>      https://savannah.gnu.org/bugs/?func=additem&group=octave
>> 
>> Ben
> 
> I filed a bug report.
> 
>       https://savannah.gnu.org/bugs/index.php?35330
> 
> Ben

I've pushed a changeset.

        http://hg.savannah.gnu.org/hgweb/octave/rev/35903f035390

Walter, the part you need is the change to __pltopt__.m. The change there is 
trivial. If you are inclined, you can edit your copy of __pltopt__.m and make 
the change yourself.

Ben