text encoding in plots

[pmts]

Hi. This is the first time I'm doing plots in octave and I have a problem.

I have an octave script encoded in UTF-8 and I need to make a plot with axes
labeled in Polish. Unfortunately it's giving me problems. The following
lines work fine:

plot(normv);
xlabel("Potęga");
ylabel("Norma");

that is, a gnuplot wxt window appears with correctly labelled axes. However,
when I do "print file.png" I get a lot of "warning: ft_render: skipping
missing glyph for character `�'" and the result looks like this:
http://i.imgur.com/wCwVK.png .

Can someone shed a bit of light on this? Thanks in advane.



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