[Numpy-discussion] maximum value and corresponding index

Robert Kern robert.kern@gmail....
Thu Aug 6 10:27:51 CDT 2009


2009/8/6 Hans Meine <meine@informatik.uni-hamburg.de>:
> On Wednesday 05 August 2009 22:06:03 David Goldsmith wrote:
>> But you can "cheat" and put them on one line (if that's all you're after):
>> >>> x = np.array([1, 2, 3])
>> >>> maxi = x.argmax(); maxv = x[maxi]
>
> Is there any reason not to put this as a convenience function into numpy?
> It is needed so frequently, and it's a shame that the shortest solution
> traverses the array twice (the above is usually longer due to variable names,
> and/or >1 dimensions).

The array is only traversed once. Indexing is O(1).

I'm -1 on adding a function to do this. If you want to keep that
convenience function in your own utilities, great.

-- 
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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