[Octave-bug-tracker] [bug #66652] Element power operator introduces numerical error when broadcasting

[Nicholas Jankowski]

Update of bug #66652 (group octave):

                Severity:              3 - Normal => 2 - Minor
              Item Group:        Incorrect Result => Inaccurate Result
                  Status:                    None => Confirmed
                 Summary: Element power operator causes numerical error but
only if broadcasting vector => Element power operator introduces numerical
error when broadcasting

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Follow-up Comment #1:

can confirm.  it seems any combination/orientation of matrix/vectors that
require broadcasting introduce numerical error while 'the same' operations
requiring no expansion do not.  This suggests different operations are being
performed, or broadcasting is skipping some steps that are otherwise taken to
ensure 'nice' answers.
these are mostly numerically small.  all values of x-round(x) appear to be
smaller than eps(x).  So, I'm dropping severity and recategorizing from
'incorrect result' to 'inaccurate result', even though that might be
overstating things. 

It might be worth looking at why these operations result in different
numerical results when they should be doing the same thing.


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