gnuplot: plotting custom function at given discrete points with linespoints

Question

I want to plot a function, let say, f(x) = 1-0.5^x. And I want to plot it at given discrete points: x = 4,8,12,16...32, with points connected with the linespoints style. No external file is supposed to be needed. I know there's a way to do it in matlab/octave but I want to do it in gnuplot (for consistent style, because I have many other figures drawn in gnuplot). I have searched for results about plotting functions over a continuous interval. But I can't find how I can explicitly set some x points to plot. Pre-generating the x's and y's into a file is a viable option but sounds stupid. Is there a way to do it on the fly in gnuplot?

Wolf · Accepted Answer · 2019-05-10 10:24:45Z

4

For equidistant x-values like you mention you must only set xrange, xtics and the number of samples properly:

set xrange [4:32]
set samples (32 - 4)/4 + 1
set xtics 4
f(x) = 1 - 0.5**x
plot f(x) with linespoints pt 7 ps 2

In general you cannot define an array of value where you want the numbers to be computed. If you need a more sophisticated selection of sampling values, you could use the + special file name.

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edited May 10, 2019 at 10:24

Wolf

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answered Sep 13, 2014 at 16:25

Christoph

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2 Comments

Neo1989 Over a year ago

Thanks, that's exactly what I want.

Wolf Over a year ago

This helped me, partly: after some scaling and scrolling, the points get out of sync. How can I reset the state variables responsible for this, or is this only possible by restart?

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