Graphs for the introduction to gnuplot for LaTeX users appeared on ArsTeXnica on April, 2011. http://www.guit.sssup.it/arstexnica/
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#
# 01_seno
#
# Created by Emiliano Vavassori on 2011-03-14.
# Copyright (c) 2011 __MyCompanyName__. All rights reserved.
#
set terminal lua tikz color solid tikzarrows scale 0.65,0.53
set output "../img/01_seno.gtx"
unset title
unset xlabel; unset ylabel
set border 3
set yrange[-1:1]
set xrange[0:2*pi]
set ytics out nomirror norotate scale 0.5 (-1, 0, 1)
set xtics out nomirror norotate ( "0" 0, "$\\frac{\\pi}{2}$" 0.5*pi, "$\\pi$" pi, "$\\frac{3\\thinspace\\pi}{2}$" 1.5*pi,"$2\\thinspace\\pi$" 2*pi) scale 0.5
unset xlabel
unset ylabel
set key below
plot sin(x) with lines title "$\\sin(x)$", cos(x) with lines title "$\\cos(x)$"