#
# plot coz(z)
# usage: gnuplot this.file
#
set hidden3d
set isosamples 29
set parametric
pi = atan(1) * 4
set urange[-pi * 2:pi * 2]
set vrange[-2:2]
r(u, v) = cos(u) * cosh(v)
i(u, v) = -sin(u) * sinh(v)

splot u + i(u, v) / 2, v + i(u, v) / 2, r(u, v) + i(u, v) / 2
pause -1 "Hit return"