gnuplot: Plot file with linespoints but with fewer points

Question

I want to plot a file with linespoints in Gnuplot but the line using all the data samples and the points using fewer data samples. For example the following file plots the data but the line is not visible at all.

set terminal png
set out "plot_sample.png"
plot [t=-1000:1000] t w linespoints pt 64 lt 10 ps 1.5

How to do it if I want to define a custom sampling interval for the points but use all the data samples for the line? I could do two separate plots in the same figure but then the key will show both of them separately.

Christoph · Accepted Answer · 2016-05-10 15:17:09Z

10

Use pointinterval to reduce the number of plotted points, but keep all points for drawing the line:

set samples 100
plot x**2 w linespoints pointinterval 10

answered May 10, 2016 at 15:17

Christoph

48.7k8 gold badges94 silver badges198 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Tom Solid Over a year ago

you've beaten me m(_ _)m

Christoph Over a year ago

@gnzlbg pointinterval is an option specific to linespoints. To plot only every tenth point, use plot ... every 10 with points

Martin Over a year ago

But the every command only works for data points, right? What if you want to plot a function with points and control the point density?

Christoph Over a year ago

@Martin That's what ``set samples` does

Tom Solid · Accepted Answer · 2016-05-10 13:20:59Z

2

Use every to reduce the samples taken from file!
Plot the line and the points in two part, and use notitle at one of them!
Don't forget to 'synchronize' the color of the 2 plots!

Something like:

plot [t=-1000:1000] 'data.dat' w l lt 10 lc 10 t 'something', '' every 10 w p pt 64 ps 1.5 lc 10 notitle

NOTES

Usage of every: plot 'alma.dat' every A:B:C:D:E:F

where

A is the data increment (every Ath)
B is the datablock increment (datablocks are separated by empty lines)
C/D is the first data/datablock (start from C/D)
E/F is the last data/datablock (end at E/F)

You can use all the features described above, but if you don't need, just leave it empty, eg. ...every 2 or every 2::1 or every 2::1:0 ect...

edited May 10, 2016 at 13:20

answered May 10, 2016 at 13:11

Tom Solid

2,5312 gold badges18 silver badges35 bronze badges

Collectives™ on Stack Overflow

gnuplot: Plot file with linespoints but with fewer points

2 Answers 2

4 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related