Quick plotting of a function

seq 0 0.1 20 | awk '{print $1, cos(0.5*$1)*sin(5*$1)}' | graph -T X
The arguments of "seq" indicate the starting value, step size, and the end value of the x-range. "awk" outputs (x, f(x)) pairs and pipes them to "graph", which is part of the "plotutils" package.

2
By: kaan
2009-03-24 21:46:59

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What Others Think

very sweet. not much daily use for me tho.
linuxrawkstar · 482 weeks and 2 days ago
using 'gnuplot' would be much easier. echo 'plot cos(0.5*x)*sin(5*x)' | gnuplot -persist
jxy · 482 weeks and 1 day ago
Gnuplot is an alternative, yes, but not necessarily easier. By changing the seq arguments, you can change the x range and step size. Your example with Gnuplot doesn't do this unless you bloat the command with 'set xrange ...' etc. Of course, for finer tuning and better, one can create a gnuplot script. But this site is about one-line commands, and this command is meant only for a quick look at a function.
kaan · 481 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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