How to plot a point on a function in gnuplot

Question

I need to plot a point on a graph of a function. I've seen gnuplot> plot “< echo ‘x y’” as an example, however, that only works on the terminal and I need it to be on a .gp file. I've also seen doing set parametric plot 4,3 but then I can't plot the point over the graph of the function.

Is there a way to do this?

andyras · Accepted Answer · 2012-04-26 12:15:29Z

1

Try something like:

set terminal postscript enhanced color
set output 'plot.eps'

set xr[-10:10]
set yr[-2:2]
plot sin(x), \
 "<echo '3.141592 0'" pt 7 ps 2 notitle

The comma allows you to plot multiple things in the same plot. This way you have to specify the range and the point position manually, but it works for me in a plot script in gnuplot 4.6.

answered Apr 26, 2012 at 12:15

andyras

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mgilson Over a year ago

This doesn't really matter, but you don't need the single quote inside the double quotes. i.e. "< echo 3.14159 0" is just fine.

mgilson · Accepted Answer · 2012-04-28 18:13:37Z

1

another option is to use 'inline data'

plot sin(x) w lines, '-' w p pt 7 ps 5
   3.14 0
e

answered Apr 28, 2012 at 18:13

mgilson

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