[Octave-bug-tracker] [bug #32275] "surf" function incorrectly handles NaN in colour data

[Ben Abbott]

Follow-up Comment #4, bug #32275 (project octave):

After some more thought, I'm not sure Matlab is doing the right thing. The
cdata corresponds to the color at the corners of the mesh. When FaceColor =
"flat", the average of the RBG values of the vertices are used to determine
the color of each rectangle in the mesh. If one vertex has a NaN, shouldn't
*four* mesh elements be empty / missing?

When run in Octave and using the gnuplot backend, replacing the NaN with Inf
produces the result I'd expect for NaN.


c = [1 1.5 -1 0.2 2; 2 1.8 1.2 0.4 -0.8;1.6 Inf 0.7 2 -2;-1.1 1.5 0.1 -0.7 0];
[nr, nc] = size(c); 
[x, y] = meshgrid (1:nc, 1:nr); 
surf(x,y,zeros(size(x)),c)
view (0, 90)


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