Re: Differences between graphics_toolkits, greek letters

[Walter White]

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?