Gnuplot matrix plot without interpolation not working

Question

I am trying to plot a matrix plot with Gnuplot version 5.0 without interpolation between values.

I am using the following code and data from http://www.gnuplotting.org/tag/matrix/.

However, the image I does not produce discrete regions in the plot and instead interpolates between values. Why is the "with image" option not working?

code

set palette grey
plot 'color_map.dat' matrix with image

with the following data

0 1 2 3 4 3 2 1 0
0 1 2 3 4 3 2 1 0
0 1 2 3 4 3 2 1 0
0 1 2 3 4 3 2 1 0
0 1 2 3 4 3 2 1 0
0 1 2 3 4 3 2 1 0

Your example works fine. Most probably, your problem is related to the viewer you are using, see e.g. stackoverflow.com/q/25736904/2604213 — Christoph
– Christoph, Commented May 11, 2015 at 10:45
I was using postscript. When I switched to svg it was working fine. Wierd! — user2105632
– user2105632, Commented May 14, 2015 at 2:10

Stefan Jaumann · Accepted Answer · 2017-01-28 11:03:23Z

2

I've been searching for this command for quite some time and stumbled across the answer recently. By using

plot 'color_map.dat' matrix u 1:2:3 with image pixels

one can keep the vectorgraphics (pdf) terminal.

The solution was taken from here.

edited Jan 28, 2017 at 11:03

answered Jan 28, 2017 at 7:53

Stefan Jaumann

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