autogenerated by webify.pl on Sun Sep 17 20:23:24 2023 gnuplot version gnuplot 6.0 patchlevel rc2
#
# Demo of plotting piecewise functions
#
unset border
set key center top reverse Left
set xzeroaxis
set yzeroaxis
set xtics axis out scale 1,8
set xtics add (1.00000 1, 6.28319 1)
set ytics axis
set title "Piecewise function sampling" font ",15"
set xrange [ -2 : 10 ] noreverse nowriteback
plot sample [*:1] x, [1:2.*pi] cos(x), [2.*pi:10] (x-8)**2
Click here for minimal script to generate this plot
reset
#
# This example taken from
# http://amca01.wordpress.com/2012/05/29/a-piecewise-polynomial-approximation-to-the-normal-cdf/
# Original approximation from John Hoyt (1962), The American Statistician 22:25-26.
#
set termopt enhanced
set termopt dash
save_encoding = GPVAL_ENCODING; set encoding utf8
set title "Piecewise approximation to the\nNormal Cumulative Distribution Function"
set format "%.1f"
set key left Left reverse invert
set style data lines
set xtics nomirror
set xrange [ 0 : 4 ]
set yrange [ 0.5 : 1.1 ]
set style line 1 lt 0 lw 3
set style line 2 lt 0 lw 3 lc rgb "red"
part1(x) = 0.5 + (9.*x-x**3)/ 24.
part2(x) = 1.0 + (x-3.0)**3 / 48.
part1 = "part1: for x < 1 norm(x) ≈ ½ + (9x-x^3) / 24"
part2 = "part2: for x > 1 norm(x) ≈ 1 + (x-3)^3 / 48"
set label 1 at 1.0, 0.62
set label 1 "plot norm(x), [0:1] part1(x), [1:4] part2(x)"
set arrow 1 from 1.,.7 to 1.,.9 nohead
plot norm(x) lt -1, \
[1:4] part2(x) ls 2 title part2, \
[0:1] part1(x) ls 1 title part1
Click here for minimal script to generate this plot
set termopt solid
reset
set border 16
unset xtics
unset ytics
set xyplane at 0
set style data lines
set key center at screen 0.5, screen 0.15
set title font ",15"
set title "Piecewise function of one parameter in 3D"
splot [-2:2][-2:2] sample \
[h=1:5] '+' using (cos(h)):(sin(h)):(h) lw 2, \
[h=5:10] '+' using (cos(h)):(sin(h)):(h) lw 4, \
[h=10:15] '+' using (cos(h)):(sin(h)):(h) lw 2
Click here for minimal script to generate this plot