Fast argmax in Python

In my post Computing argmax fast in Python, I reported that Python has no builtin function to compute argmax, the position of a maximal value. I provided one such function and asked people to improve my solution. Here are the results:

argmax function running time
array.index(max(array)) 0.1 s
max(izip(array, xrange(len(array))))[1] 0.2 s

Conclusion: array.index(max(array)) is simpler and faster.

Update: Please see The language interpreters are the new machines.

Published by

Daniel Lemire

A computer science professor at the University of Quebec (TELUQ).

5 thoughts on “Fast argmax in Python”

  1. Complexity of these operations with regard to array length would be more interesting. I think that your conclusion is a bit too wide.

Leave a Reply

Your email address will not be published. The comment form expects plain text. If you need to format your text, you can use HTML elements such strong, blockquote, cite, code and em. For formatting code as HTML automatically, I recommend

You may subscribe to this blog by email.