Image:Log-factorial.PNG

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[edit] Sumário

Image created on en.wiki by user MarkSweep

Plot of the natural logarithm of the factorial function (strictly speaking it's the gamma function)

Created with the following gnuplot script:

set samples 1001
set terminal postscript enhanced color solid lw 2 "Times-Roman" 27
set output
set key left
set grid
plot [0:20000] lgamma(x+1) title "ln(x!)"

Shell script for conversion to PNG format:

#! /bin/sh
set -e
TMPFILE=`mktemp gp2png-temp.XXXXXX`

gnuplot $1 |
gs -q -dNOPAUSE -dBATCH -sDEVICE=ppmraw -r200 -sOutputFile=- -f - |
pnmrotate -90 |
pnmscale 0.27272727272727 |
pnmtopng > $TMPFILE

pngcrush -brute $TMPFILE `basename $1 .gp`.png
rm -f $TMPFILE

[edit] Licensing

GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

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