I have a datafile that looks like this:
1 2 3 0.5
2 8 9 0.2
3 4 78 0.4
6 5 7 0.01
9 9 9 0.3
10 12 18 0.9
6 8 4 1
I would like to do a graph like this http://2.bp.blogspot.com/-378_rAaSSVU/UzU0gnGcr9I/AAAAAAAABnU/P1GwP9RKBkM/s1600/gnuplot.png Where the 4th column is the color.
I tried - obviously incorrect because I do not use the fourth column but I failed to find anything in the documentation:
set dgrid3d 30,30
set view 60,45
set hidden3d
dataFile='prova.dat'
set palette defined (0 "blue", 0.5 "white", 1 "pink")
set pm3d
splot dataFile u 1:2:3 with pm3d
Is somethings like that possible?
Using only
pm3d
you can use a fourth column to select a color independent of the z-value. Together withdgrid3d
this is not directly possible, because the gridding is not performed on the color column.You can use a workaround: First you plot the gridded z-value to one file, then the gridded color values to a second file and as last point you disable
dgrid3d
, merge the two temporary files on-the-fly and plot their values:Note, that
paste
is a command line tool for Unix-like operation systems. For a similar solution for windows, you can e.g. write a small Python scriptpaste.py
(see my answer to Get ratio from 2 files in gnuplot for a possible implementation). Then you must run thewgnuplot_pipes.exe
binary file and thesplot
command becomesOf course, for this you must have python installed and the python binary must be available via the
PATH
environment variable.