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From: Dan Luecking <LookInSig@uark.edu>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Setting ticks marks  for sine curve - pi to pi
Date: Tue, 06 Mar 2012 12:30:38 -0600
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On Mon, 5 Mar 2012 18:35:35 -0800 (PST), Mark Lim <mklim.77@gmail.com>
wrote:

>Hi
>
>My gnuplot 4.4  encounter this
>
>
>gnuplot> set xtics ('$-\pi$ -pi,\'$-frac{\pi}{2}$' -pi/2,\"0" 0,\'$
>\frac{\pi}{2}$' pi/2,\'$\pi$' pi)
>                                        ^
>         invalid complex constant
>
>
>2. Any ideas how to fix this?
>
>I got this command straight from the article by David Kotz entitled
>Latex and gnuplot Plotting Program 5 Feb2012.

You have run all the lines together. The actual code is

set xtics ('$-\pi$' -pi,\
'$-\frac{\pi}{2}$' -pi/2,\
"0" 0,\
'$\frac{\pi}{2}$' pi/2,\
'$\pi$' pi)

The backslashes at the end of those lines say to ignore 
the end-of-line. If you run all these together as a 
single line you have to remove the backslashes.

In your code, a \' indicates that ' should be taken literally
and not as a quote to start a string. This is probably where
gnuplot noted an error.


Dan
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