[Octave-bug-tracker] [bug #56950] NaN/Inf values in ind2rgb

[Guillaume]

URL:
  <https://savannah.gnu.org/bugs/?56950>

                 Summary: NaN/Inf values in ind2rgb
                 Project: GNU Octave
            Submitted by: gyom
            Submitted on: Wed 25 Sep 2019 11:32:43 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: Guillaume
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

ind2rgb does not allow NaN/Inf values in the indexed image while Matlab
behaves as if they were equal to the maximal index according to the size of
the colormap.


>> rgb = ind2rgb ([NaN Inf 1], jet)
rgb(:,:,1) =
   0.500000000000000   0.500000000000000                   0
rgb(:,:,2) =
     0     0     0
rgb(:,:,3) =
                   0                   0   0.562500000000000


One possible fix would be to add the following before the input check:

if isfloat (x)
  x (isnan (x) | isinf (x)) = size (map, 1);
endif





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