Re: Error in documentation/bug

On Tuesday, 25 February 2025 02:15:22 PST Dmitry wrote:
> So, documentation says that we can add latex preamble with tikz terminal 
> as *preamble "<preamble string>".*
> 
> But this actually does not work, it fails with
> 
> /usr/share/gnuplot/6.1/lua/gnuplot-tikz.lua:1773: bad argument #1 to 
> 'load' (function expected, got string)
> 
> Instead of *preamble "<preamble string>" *one should use *preamble 
> '<preamble string>' *(single quotes vs double quotes).

Remember that inside double quotes backslash is an escape character,
so your command needs to be

     set term tikz standalone preamble "\\usepackage{derivative}"

This has nothing to do with tikz. It is the usual difference between string
handling in single vs double quotes.

	Ethan




> 
> I'm not sure if its bug or it's wrong documentation. Below I listed the  
> full console output
> 
> Thanks!
> 
> 
> > $ gnuplot
> >
> >     G N U P L O T
> >     Version 6.1.0 last modified 2025-02-19
> >
> >     Copyright (C) 1986-1993, 1998, 2004, 2007-2025
> >     Thomas Williams, Colin Kelley and many others
> >
> >     gnuplot home: http://www.gnuplot.info
> >     mailing list: [email protected]
> >     faq, bugs, etc:   type "help FAQ"
> >     immediate help:   type "help"  (plot window: hit 'h')
> >
> >     Terminal type is now qt
> > gnuplot> set terminal lua tikz standalone preamble 
> > "\usepackage{derivative}"
> >
> > Terminal type is now 'lua'
> >          /usr/share/gnuplot/6.1/lua/gnuplot-tikz.lua:1773: bad 
> > argument #1 to 'load' (function expected, got string)
> > stack traceb
> >
> > gnuplot> set terminal lua tikz standalone preamble 
> > '\usepackage{derivative}'
> >
> > Terminal type is now 'lua'
> > Options are 'latex preamble "\\usepackage{derivative}"  color 
> > standalone nogparrows notikzarrows nogppoints picenvironment 
> > nooriginreset bitmap rgbimage noclip notightboundingbox noexternalimages '
> > gnuplot>
> 
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