[Octave-bug-tracker] [bug #60786] mpower: negative scalar to power of matrix containing non-integers returns nan

[Rik]

Follow-up Comment #20, bug #60786 (project octave):

Testing code from comment #17 produces different results on my machine. 
Instead of jwe's results of


1
(nan,nan)
(-nan,-nan)
(nan,nan)


I get


1
(1,0)
(-nan,-nan)
(1,0)


This is with a C++ stdlib from Kubuntu 18.04.


ii  libstdc++6:amd64                                8.4.0-1ubuntu1~18.04      
                         amd64        GNU Standard C++ Library v3


The fact that results seem to change with changing library versions is not a
good sign, and points to implementing our own wrappers to get the results we
want.

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