How to use psfrag and psfragx


1. psfrag can be used with any eps file
created by, say, xfig, gnuplot, maple, or matlab 
provided you have placed "markers" in the file
which you will later replace with latex symbols
using psfrag.  For example, if you have put
A,B and C in your eps file, you may use the commands

\psfrag{A}{$\alpha$}
\psfrag{B}{$\beta$}
\psfrag{C}{$\gamma$}
\includegraphics{myfile.eps}

to replace the with their greek equivalents. Of course
we assume you are using the graphics or graphicx package
as well as the psfrag package.

2. psfragx goes one step beyond psfrag. Suppose that
you did not have the foresight to put those markers in
or someone gave you an eps file without labels, but you
want to insert some symbols in it. You can use psfragx
to arbitrarily place symbols or math phrases in your file.
The format of a psfragx file is this:


\begin{filecontents}{example.tex}
\documentclass{article}
\usepackage[sub,ovp]{psfragx}
\usepackage{overpic,color}

\pagestyle{empty}

\begin{document}
\begin{overpic}[height=.25\textheight,width=.75\textwidth]{example.eps}
%% Test Coordinates
\put(0,0){\large\bf (0,0)}
\put(0,100){\large\bf (0,100)}
\put(100,0){\large\bf (100,0)}
\put(100,100){\large\bf (100,100)}
%% Our additions
\put(0,-3){$-\pi$}
\put(25,-3){$-\pi/2$}
\put(50,-3){$0$}
\put(75,-3){$\pi/2$}
\put(100,-3){$\pi$}
\put(0,2){\vector(1,0){100}} % Y-axis
\put(50,1){\vector(0,1){55}} % X-axis

\end{overpic}

\end{document}
\end{filecontents}
\begin{filecontents*}{example.eps}
[insert your ps file here]
\end{filecontents*}
\input{example.tex}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Generic psfragx file to check the
%% coordinates of the bounding box
%% to use it, put an .eps file where
%% you see
%% [insert your ps file here]
%% Running latex on this file will
%% generate example.tex and example.eps
%% so rm these before using.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%