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From: Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Escaping special characters into titles/axis labels
Date: Sun, 21 Mar 2021 09:32:37 +0000
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On 19/03/2021 19:59, Karl Ratzsch wrote:
> Am 19.03.2021 um 17:13 schrieb Martin Brown:
>> I'm new to gnuplot and find it very powerful but there are a couple of 
>> fairly simple things that I just can't see how to do.
>>
>> One is to escape in the greek symbol 'alpha', 'beta','theta' or 'pi' 
>> or equivalently to tell the axis scaling logic that I would like an 
>> axis to scaled in fractions of pi. I can rename the variables but pi 
>> is well pi!
> 
> 
> The most straightforward method is to set all tics explicitly
> 
>      set xtics pi ('pi/2' pi/2, 'pi' pi, '3pi/2' 3*pi/2, \
>                '2pi' 2*pi, '5pi/2' 5*pi/2, '3pi' 3*pi)
>      set grid
>      plot [0:3*pi] sin(x)
> 
> , you might use a "do for" loop to create the tics/labels as a macro 
> string. Alternatively you can just scale everything
> 
>      set xtics .5 format '%hpi'
>      set grid
>      plot [0:3] sin(x*pi) title 'sin(x)'
> 
> . It could be nice to be able to add a piece of math containing the axis 
> variable to the format string, like with gprintf(). You can post a 
> feature request on gnuplot.sf.net
> 
> Use utf8 encoding ("set encoding utf8") to put in the pi symbol (copy 
> the greek symbols from a web page), or use one of the latex terminals.

Thank you for your very helpful explanation of how to do it.

-- 
Regards,
Martin Brown