Re: [Gnuplot-info] How to simply get contour or surface plot form datafile?

[theozh <th...@gm...>]

although there are a few examples at
http://gnuplot.sourceforge.net/demo/

I still find it pretty confusing
about plot, splot, matrix, with image, surface plot, contour plot or
2D/3D heatmap...

Anyway, to my understanding if you have data which is not in a regular
matrix, i.e. "non-gridded data" you first need to convert the data into
a regular grid (see "set dgrid3d").
See example: non-gridded data


Maybe the following code helps you?
The file "RandomMesh.dat" consist of 3 columns with x y z data, so
similar to your data.


####### Plot arbitrary mesh data
reset

set view map
set dgrid3d 30,30,10
set palette rgbformulae 33,13,10

set multiplot layout 1,2

set surface
unset contour
splot "RandomMesh.dat" w pm3d

unset surface
set contour
set cntrparam levels 10
splot "RandomMesh.dat" w pm3d

unset multiplot
####### EOF