Gri graphical language
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Gri is a programming language for creating scientific graphics.[1] It is licensed under the terms of the GNU General Public License.
Some users consider Gri similar to LaTeX, since both provide extensive power as a reward for tolerating a learning curve.
Gri can make x-y graphs, contour graphs, and image graphs, outputting the results in PostScript format. Control is provided over all aspects of drawing, e.g. line widths, colors, and fonts. A limited TeX-like syntax provides common mathematical symbols.[2]
An example Gri program:
open file.dat
read columns x y
draw curve