Gnuplot

Gnuplot is a programming language created in 1986.

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gnuplot is a command-line program that can generate two- and three-dimensional plots of functions, data, and data fits. It is frequently used for publication-quality graphics as well as in education. The program runs on all major computers and operating systems (Linux, Unix, Microsoft Windows, macOS, and others). Read more on Wikipedia...

Gnuplot website
Gnuplot Wikipedia page
There are at least 2,276 Gnuplot repos on GitHub
Gnuplot first developed in https://sourceforge.net/p/gnuplot/mailman/
file extensions for Gnuplot include gp, gnu, gnuplot, p, plot and plt
The Google BigQuery Public Dataset GitHub snapshot shows 3k users using Gnuplot in 3k repos on GitHub
Explore Gnuplot snippets on Rosetta Code
Gnuplot Ubuntu package
Pygments supports syntax highlighting for Gnuplot
GitHub supports syntax highlighting for Gnuplot
Gnuplot appears in the Quine Relay project
There is 1 Jupyter Kernel for Gnuplot
gnuplot.info was registered in 2002
See also: (20 related languages)C, Linux, Unix, SVG, LaTeX, Lua, Maxima, GNU Octave, Perl, Perl Data Language, Python, Sage, Julia, Java, Ruby, Ch computer programming, Haskell, Smalltalk, Squeak, Matplotlib
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Example from Riju:

print "Hello, world!"

Example from Linguist:

#!/usr/bin/env gnuplot

reset

set terminal png
set output 'rates100.png'

set xlabel "A2A price"
set ylabel "Response Rate"

#set xr [0:5]
#set yr [0:6]

plot 'rates100.dat' pt 7 notitle

Example from Wikipedia:

set title "Some Math Functions"
set xrange [-10:10]
set yrange [-2:2]
set zeroaxis
plot (x/4)**2, sin(x), 1/x

title	authors	year	publisher
gnuplot Cookbook	Phillips, Lee	2012	Packt Publishing
Gnuplot in Action: Understanding Data with Graphs	Philipp K. Janert	2009	Manning Publications
gnuplot Cookbook	Phillips, Lee	2012	Packt Publishing

Gnuplot - Programming language

Language features

Books about Gnuplot from ISBNdb