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Groups > comp.graphics.apps.gnuplot > #2542

heatmaps: splot matrix with image ?

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Hello,

I have been playing with 5.0_rc1 and also trying to plot heatmaps.
Not sure if I got it right, please advise if there are better ways to do.

Here is a script that works fine (needs 5.0 for the <<EOD it seems), but how can I have non-numeric data labels for the matrix?

How can I plot $REAL (instead of $FAKE) or similar to that (the data to plot is dump from a DB in similar format)?

This is a very simplified example (plotting Bulgarian flag), the real data is about 100x100 matrix.

---------------------------------------------------------------
#!/usr/bin/gnuplot

reset;
set datafile separator "\t";

$FAKE << EOD
3	0	1	2
0	2	2	2
1	1	1	1
2	0	0	0
EOD

$REAL << EOD
3	a	b	c
A	2	2	2
B	1	1	1
C	0	0	0
EOD

unset key; unset colorbox; unset xtics; unset ytics;
set xrange [-0.5:2.5]; set yrange [-0.5:2.5];
set palette defined (0 "#FFFFFF", 1 "#00966E", 2 "#D62612");
set view map;

set xtics nomirror out ("A" 0, "B" 1, "C" 2);
set ytics nomirror out ("a" 0, "b" 1, "c" 2);
splot "$FAKE" nonuniform matrix using 1:2:3 with image;

#splot "$REAL" ???
---------------------------------------------------------------


I hope something doesn't eat the tabs in the file...

Also, is there a way to add thin black border around each square?
And finally, a way to avoid 0.5unit shift, so z(0,0) sits on 0,0, not centered there?

Cheers,
Kalin.

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heatmaps: splot matrix with image ? Kalin Kozhuharov <me.kalin@gmail.com> - 2014-07-29 02:04 -0700
  Re: heatmaps: splot matrix with image ? Ethan A Merritt <EAMerritt@gmail.com> - 2014-07-30 22:30 -0700
    Re: heatmaps: splot matrix with image ? Kalin Kozhuharov <me.kalin@gmail.com> - 2014-08-19 11:41 -0700

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