[Numpy-discussion] Question about numpy.max(<complex matrix>)
Robert Kern
robert.kern@gmail....
Fri Sep 21 15:57:33 CDT 2007
Stuart Brorson wrote:
> Thank you for your answer!
>
>>> As a NumPy newbie, I am still learning things about NumPy which I didn't
>>> expect. Today I learned that for a matrix of complex numbers,
>>> numpy.max() returns the element with the largest *real* part, not the
>>> element with the largest *magnitude*.
>> There isn't a single, well-defined (partial) ordering of complex numbers. Both
>> the lexicographical ordering (numpy) and the magnitude (Matlab) are useful
>
> [... snip ...]
>
> Yeah, I know this. In fact, one can think of zillions of way to
> induce an ordering on the complex numbers, like Hamming distance,
> ordering via size of imaginary component, etc. And each might have
> some advantages in a particular problem domain.
>
> Therefore, perhaps I need to refocus, or perhaps sharpen my question:
> Is it NumPy's goal to be as compatible with Matlab as possible?
No.
> Or
> when questions of mathematical ambiguity arise (like how to order a
> sequence of complex numbers), does NumPy chose its own way?
Yes.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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