[Octave-bug-tracker] [bug #36562] NaN/Inf behaviour unexpected in sparse rdivide

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?36562>

                 Summary: NaN/Inf behaviour unexpected in sparse rdivide
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 30 May 2012 03:12:51 PM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Stuart Archibald
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.4.3
        Operating System: GNU/Linux

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Details:

rdivide with NaN as first argument does not behave as expected with sparse
array as second argument. NaN/0 = NaN, which implies NaN rdivided by sparse
should give NaN's in the positions of the the zero pattern as well as NaN's in
the non-zero pattern.

Example

octave:1> rdivide(NaN,sparse([1,3],[1,3],[1,3]))
ans =

   NaN  -Inf  -Inf
  -Inf  -Inf  -Inf
  -Inf  -Inf   NaN


I would expect the answer to be:

ans =
   NaN   NaN   NaN
   NaN   NaN   NaN
   NaN   NaN   NaN





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File Attachments:


-------------------------------------------------------
Date: Wed 30 May 2012 03:12:51 PM UTC  Name: sparseNaNbug.m  Size: 68B   By:
None
Script demonstrates the problem
<http://savannah.gnu.org/bugs/download.php?file_id=25956>

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