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[Octave-bug-tracker] [bug #49022] "demo light 11" results in gnuplot err

From: Rik
Subject: [Octave-bug-tracker] [bug #49022] "demo light 11" results in gnuplot errors
Date: Wed, 14 Sep 2016 18:45:04 +0000 (UTC)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0

Follow-up Comment #3, bug #49022 (project octave):

The problem seems to be that color has one entry rather than 3.  I can trace
this back to 

              if ((strcmp (ec, "flat") || strcmp (ec, "interp"))
                  && isfield (obj, "cdata"))
                if (ndims (obj.cdata) == 2
                    && (columns (obj.cdata) == nc
                        && (rows (obj.cdata) == 1
                            || rows (obj.cdata) == 3)))
                  ccol = cdat(:, i);
                elseif (ndims (obj.cdata) == 2
                        && (rows (obj.cdata) == nc
                            && (columns (obj.cdata) == 1
                                || columns (obj.cdata) == 3)))
                  ccol = cdat(i, :);
                elseif (ndims (obj.cdata) == 3)
                  ccol = permute (cdat (:, i, :), [1, 3, 2]);
                  ccol = cdat;

It seems that cdat is 3xN so that the line picked out is 

                  ccol = cdat(:, i);

But that makes ccol a 3x1 vector, rather than a 1x3 vector which is the usual.
 If I add a transpose 

                  ccol = cdat(:, i).';

then I get a 1x3 vector, but some of the values are negative.  So, whatever
cdata is getting produced, it is not RGB.


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