[Octave-bug-tracker] [bug #51249] center() relies on broadcasting

[Guillaume]

URL:
  <http://savannah.gnu.org/bugs/?51249>

                 Summary: center() relies on broadcasting
                 Project: GNU Octave
            Submitted by: gyom
            Submitted on: Fri 16 Jun 2017 02:10:26 PM 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:

The fact that center() relies on broadcasting makes it crash when the input is
a sparse or diagonal matrix:


>> center (eye (3))
error: center: operator -: nonconformant arguments (op1 is 3x3, op2 is 1x3)
error: called from
    center at line 72 column 12
>> center (sparse (rand (3)))
error: center: operator -: nonconformant arguments (op1 is 3x3, op2 is 1x3)
error: called from
    center at line 72 column 12


These limitations of broadcasting are known (see bug #41441 and bug #35787)
but are quite annoying when core functions rely on it - I came across this
while calling var() on a sparse matrix.

If fixing the mentioned bugs are long term projects, would it be ok to modify
center() not to rely on broadcasting and use bsxfun() instead?




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