Plotting heatmaps in gnuplot

2
votes

So, here I am trying to plot heatmaps in gnuplot. I have a matrix-formatted text file (with row and column headers), and the command I am using to plot it is

plot "file.txt" matrix rowheaders columnheaders using 1:2:3 w image notitle

The output is this graph: enter image description here

Obviously, the X and Y labels are useless like this. I believe the problem here is that gnuplot is extracting all labels from the file and plotting them. How would I go about reducing the amount of clutter in here, e.g. plotting every 10th label or so?

Thanks in advance.

1
gnuplotheatmap
You cannot reduce the number of labels plotted with rowheaders columnnheaders. Do you really need them? Looks to me like you can use normal numerical labels. – Christoph
Well, no, I don't really require them to be there. Oh well, I'll just remove them completely. Thanks for clearing things up for me. – Zvonimir Domazet
On a somewhat (un)related note, is it possible to change the color coding scale to something more logarithmic? – Zvonimir Domazet
Use set logscale cb. – Christoph

1 Answers

1
votes

Or just make the picture resolution bigger... for instance like 1920,1080 or bigger... like this:

set term pngcairo size 1920,1080

or make the tics numbers like 1000000 smaller and make a label to show that the numbers written on the tics are 1000000 bigger... or both:)

Sorry for my english...