numpy.argmax
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numpy.argmax(a, axis=None, out=None)
[source] -
Returns the indices of the maximum values along an axis.
Parameters: -
a : array_like
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Input array.
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axis : int, optional
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By default, the index is into the flattened array, otherwise along the specified axis.
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out : array, optional
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If provided, the result will be inserted into this array. It should be of the appropriate shape and dtype.
Returns: -
index_array : ndarray of ints
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Array of indices into the array. It has the same shape as
a.shape
with the dimension alongaxis
removed.
See also
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amax
- The maximum value along a given axis.
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unravel_index
- Convert a flat index into an index tuple.
Notes
In case of multiple occurrences of the maximum values, the indices corresponding to the first occurrence are returned.
Examples
>>> a = np.arange(6).reshape(2,3) + 10 >>> a array([[10, 11, 12], [13, 14, 15]]) >>> np.argmax(a) 5 >>> np.argmax(a, axis=0) array([1, 1, 1]) >>> np.argmax(a, axis=1) array([2, 2])
Indexes of the maximal elements of a N-dimensional array:
>>> ind = np.unravel_index(np.argmax(a, axis=None), a.shape) >>> ind (1, 2) >>> a[ind] 15
>>> b = np.arange(6) >>> b[1] = 5 >>> b array([0, 5, 2, 3, 4, 5]) >>> np.argmax(b) # Only the first occurrence is returned. 1
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Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.argmax.html