Re: [Gnuplot-info] heatmap + ternary operator problem

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

> ...
> $ 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"

'help image' says:
> ... It is assumed that the image data forms an
> equidistant sampling grid in the viewing plane along two
> ... directions.

for each grid point a value is required, so exclusion is not possible.

> Mabe it isn't even possible to exclude points from grid data like this?
> Any clues??

make the unwanted points white:

set pal mod RGB funct (gray>1./400.?sqrt(gray):1), (gray>1./400.?gray**3:1),
(gray>1./400.?sin(gray*2.*pi):1)

(you may replace 1./400. by some value smaller than your valid data)
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