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From: neurino <lelli.luca@googlemail.com>
Newsgroups: comp.graphics.apps.gnuplot
Subject: splot with dgrid3d / pm3d?
Date: Sun, 10 Feb 2013 04:13:39 +0100
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Xref: csiph.com comp.graphics.apps.gnuplot:1616

Dear gnuplotters,

i have 3D data, which look like this
# x y z
1996-12 68 -0.09928498
1996-12 69 -0.1597349
1996-12 70 -0.009438827
...
...
1997-01 68 -0.09928498
1997-01 69 -0.1597349
1997-01 70 -0.009438827

and so on, 192 data (x) blocks, each of 141 values (y).

The following plot
http://img39.imageshack.us/img39/8113/cthanzonalfull.jpg

has been created with (relevant commands):

set pm3d map
set isosample 1200
set xdata time
set timefmt "%Y-%m-%d"
splot f1 u 1:2:3 notitle

However, i'd like to smooth them and highlight patterns.
I am having difficult times with set dgrid3d, because if i set

set dgrid3d 40,40,16

i get this result
http://img16.imageshack.us/img16/1641/testiiq.jpg

So, from the demos i don't get how the non-gridded data should be 
preprocessed, having set dgrid3d instead of pm3d, given that the nice 
demos are achieved with splot 1:2:3 too.

Thanks for the help.