Re: Missing/invalid data points in PM3D

[Petr M. <mi...@ph...>]

>> With your patch of plot3d.c, all scans have the number of points as
>> intended. The rectangle(s) contaning a point with NaN are not drawn. This
>> looks like to be what is expected, so I propose you commit the plot3d.c
>> patch.
>
> I think there is still a problem with the patched version.
> I am not sure where it is, though.
>
> Have a look at the attached PNG image compared before + after the patch.
> The input data file is "triangle.dat" with two individual values
> replaced by "Junk" and "NaN" respectively.
>
> The patched version gets it almost right, but only in the case
> of "splot ... using ($1):($2):($3)"
> Even so, instead of skipping a single rectangle, it omits the
> entire rest of the scan line.

You should use 'set pm3d map' to see it better.

In the non-($n) case, the plot should be the same as if you remove these 
junk lines from the datafile.

I tried your patch, and it is correct.


However, there is yet another bug:

0 2 -2
1 2 -1
2 2 0
3 2 1

0 3 0
1 3 6
2 3 2
3 3 3

0 4 1
1 4 2
2 bla 3
3 4 4

set pm3d map
splot 'bla'

=> there is a strange feature, and the debug routine in the beginning of 
pm3d_plot() print the data passed into this routine:

#IsoCurve = scan nb 0, 4 points
#x y z type(in,out,undef)
0 2 -2 i
1 2 -1 i
2 2 0 i
3 2 1 i

#IsoCurve = scan nb 1, 4 points
#x y z type(in,out,undef)
0 3 0 i
1 3 6 i
2 3 2 i
3 3 3 i

#IsoCurve = scan nb 2, 4 points
#x y z type(in,out,undef)
0 4 1 i
1 4 2 i
2 2 2 i     <====== HERE IS BUG!
3 4 4 i


Thus, the reader converted the data file line
 	2 bla 3
into
 	2 2 2 i
Correctly, there should be point (like a missing line), or
 	2 999 3 u
(999 or whatever number). I think the "missing line" behaviour is compatible 
to "plot" command.

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PM