[Gnuplot-info] heatmap + ternary operator problem

[atoms.h <l....@fr...>]

Maybe I don't understand the syntax right, but in priciple I get the plot to
work when I do

$ set view map
$ set xrange [60:200]
$ set yrange [0:300]
$ set cbrange [0:200]
$ splot "radET1.hdat" u 1:2:4 w image

This gives me a projection of my data to the xy-plane. Now, what I like to
do is to exclude points in column 4 which are zero, since in my plot they
have no physical meaning and should not be included in the pm3d coloring.
Therefore I thought something like

$ splot "radET1.hdat" u 1:2:( $4==0 ? 1/0 : 4 ) w image

would do the trick, but doesn't. It always gives errors like
"GNUPLOT (plot_image):  Image grid must be at least 2 x 2" or
"GNUPLOT (plot_image):  Visible pixel grid has a scan line shorter than
previous scan lines"

Mabe it isn't even possible to exclude points from grid data like this? Any
clues??
(For now I shifted the cbrange sightly to negative values)
 Thanks in advance,
Thomas
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