Re: Differences between graphics_toolkits, greek letters

[Ben Abbott]

On Jan 21, 2012, at 6:12 PM, Walter White wrote:

> Am 21.01.2012 15:52, schrieb Ben Abbott:
>> On Jan 21, 2012, at 5:28 AM, Walter White<address@hidden>  wrote:
>> 
>>> Am 20.01.2012 23:48, schrieb Ben Abbott:
>>>> 
>>>> On Jan 20, 2012, at 5:36 PM, Walter White wrote:
>>>> 
>>>>> Am 20.01.2012 01:54, schrieb 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
>>>>> 
>>>>> Hello,
>>>>> 
>>>>> I have another similar question and hope that you can help me again.
>>>>> 
>>>>> I would like to use "°C" within the legend but I could not figure out
>>>>> how to do this. The strange thing is that the following script displays 
>>>>> the "°C" correctly in the "Figure 1" popup window but the printed 
>>>>> png-file lacks the "°".
>>>>> 
>>>>> Any thoughts on this?
>>>>> Cheers,
>>>>> Walter
>>>>> ------------
>>>>> graphics_toolkit('gnuplot')
>>>>> 
>>>>> x = 1:10
>>>>>    y = rand(10,1)
>>>>>    label_string = '123 °C'
>>>>>    plot (x, y)
>>>>>    legend (label_string)
>>>>>    ylabel(label_string)
>>>>>    xlabel(label_string)
>>>>>    title(label_string)
>>>>> 
>>>>> print_filename = sprintf('./test_gnuplot.png')
>>>>> print(print_filename, '-dpng','-FHelvetica:8','-S1024,768')
>>>> 
>>>> I recommend you try TeX markup.
>>>> 
>>>>    label_string = "123^o C";
>>>> 
>>>> or
>>>> 
>>>>    label_string = "123^\circ C";
>>>> 
>>>> The second version may not display correctly, but should show in the png 
>>>> correctly.
>>>> 
>>>> Ben
>>>> 
>>>> 
>>> Thanks Ben, this works fine.
>>> 
>>> I played with tex mode for a while and another question arose.
>>> So far I found two different methods to change the fontsize:
>>> The one using tex mode and the other one using print.
>>> print(print_filename, '-dpng','-FHelvetica:20','-S1280,1024')
>>> 
>>> But I found out that e.g. for xlabels or title that the spacing on the
>>> top or the left does not automatically fit the fontsize if tex mode
>>> is used.
>>> 
>>> Instead it seems that print's -F parameter does set the spacing
>>> to the given font and all other fontsize commands  (e.g. tex mode)
>>> set the fontsize but will not increase the spacing if the text does
>>> not fit to the spacing anymore. Do I interpret the behaviour correctly?
>>> 
>>> Cheers,
>>> Walter
>> 
>> How did you change the fontsize using "TeX mode" ?
>> 
>> Ben
> 
> I used {\fontsize{20}Some text here}.
> This is what you call "TeX mode", right?
> I read about an option "interpreter" "tex" in the docs,
> but I did not set it.
> Is the Tex-syntax recognized automatically by Octave?

Ok. I didn't realized that "{\fontsize{20}Some text here}" would work

Ben