[Octave-bug-tracker] [bug #31536] demos for patch and isosurface fail

[Rik]

Follow-up Comment #3, bug #31536 (project octave):

Oh no, I hope I'm not abusing the poor defenseless comma-separated lists. 
:)

Actually, I might not understand the example well enough and I did look only
briefly, but I think I avoid cs-lists altogether.


For hypothetical function call patch (...,"cdata", c1, "cdata", c2).  Diary
from Octave session
args = {"cdata", [1,2,3], "cdata", [4,5,6]};
octave:2> args = { "cdata", [1,2,3], "cdata", [4,5,6] };
octave:3> class(args)
ans = cell
octave:4> eval1 = strcmpi (args, "cdata")
eval1 =

   1   0   1   0

octave:5> class eval1
ans = char
octave:6> eval2 = find(eval1, 1, "last")
eval2 =  3
octave:7> eval3 = eval2 + 1
eval3 =  4
octave:8> output_cdata = args {eval3}
output_cdata =

   4   5   6

octave:9> isvector (output_cdata )
ans =  1


What looks potentially weak to me is that if there are no matches then find
returns the empty matrix and there is the reliance on '[] + 1 == []'

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