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[Octave-bug-tracker] [bug #51333] Reductions on an empty matrix is incon


From: Kai Torben Ohlhus
Subject: [Octave-bug-tracker] [bug #51333] Reductions on an empty matrix is inconsistent
Date: Thu, 29 Jun 2017 18:24:56 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36

Update of bug #51333 (project octave):

                  Status:                    None => Confirmed              
                 Release:                   4.2.1 => dev                    

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Follow-up Comment #1:

Applies for the development version as well.

Digging into the code of "sum", "xsum", "prod", "sumsq" of an double NDArray,
I found the inline function "do_mx_red_op" to be called in any case. According
to a comment

https://hg.savannah.gnu.org/hgweb/octave/file/tip/liboctave/operators/mx-inlines.cc#l1537


// M*b inconsistency: sum ([]) = 0 etc.


it has to do with the described problem.

For "dot" the situation might be easier, as it is a seperate file which could
check for empty input values:

https://hg.savannah.gnu.org/hgweb/octave/file/tip/libinterp/corefcn/dot.cc#l67

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?51333>

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