Re: [Gnuplot-info] newbie asking for help with 'matrix' plot

[Thomas S. <t.s...@fz...>]

for a 40x40 matrix:

set xrange [0.5:40.5]
set yrange [0.5:40.5]
set pm3d map
set dgrid3d 40,40
splot 'datafile'

because gnuplot has to fill an internal matrix the splot-command takes some
time, because some data weighting is done. it would be better to produce a
matrix data file (see 'help matrix') before using gnuplot, then no 'dgrid3d'
would
be necessary.


melysion wrote:
> 
> Hi there
> 
> I've only just come across gnuplot and it all seems excellent so far.
> 
> I have a plot to do and I was wondering whether gnuplot would be a good
> piece of software to do it.  I'll have a matrix file like so
> 
> 1 1 20
> 1 2 45
> 1 3 46
> 2 1 45
> etc ...
> 
> If one imagines the first two columns as 'objects' the third column is a
> measure of similarity between those two objects. I want to create a 2D
> grid - it will probably be about 40 squares by 40 squares in size. I would
> like the measure of similarity between the two objects to be highlighted
> as a specific colour.
> 
> I've looked at pm3d plots but I'm not even sure whether thats the best
> place to start. Any tips very much appreciated.
> 

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