Coordenadas Polares

unset border
set clip
set polar
set xtics axis nomirror
set ytics axis nomirror
set samples 160
set zeroaxis
set trange [0:2*pi]
set title "Three circles (with aspect ratio distortion)"
plot .5,1,1.5

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set title ""
set key box

plot cos(2*t)

plot 2*sqrt(cos(t)),-2*sqrt(cos(t))

plot sin(4*t),cos(4*t)
set offset 0,0,0,0

set xrange [-5:5]
set yrange [-5:5]
plot t/cos(3*t)

set autoscale

plot 1-sin(t)

set trange [0:12*pi]
plot 2*t

butterfly(x)=exp(cos(x))-2*cos(4*x)+sin(x/12)**5
set samples 800
print "This is a big one (many samples), be patient..."
set title "Butterfly"
unset key
plot butterfly(t)

# undo what we've done above
reset