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argmax and argmin | Loop and Break

argmax and argmin

by · July 7, 2014

argminxf(x) is the value of x for which f(x) attains it’s minimum.
argmaxxf(x) is the value of x for which f(x) attains it’s maximum.

In Python

ARGMIN AND ARGMAX returns Indices of the minimum and maximum values along an axis.

Syntax

numpy.argmax(a, axis=None)

a (array_like) Input array.
axis (int, optional) By default, the index is into the flattened array, otherwise along the specified axis.

Returning Value

index_array (ndarray of ints) Array of indices into the array. It has the same shape as a.shape with the dimension along axis removed.

Example

>>> from numpy import *
>>> a = [[1,2,4],[6,3,8],[9,6,1]]
>>> argmax(a)
6
>>> argmin(a)
0
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