numpy.ptp(a, axis=None, out=None)

Range of values (maximum - minimum) along an axis.

The name of the function comes from the acronym for ‘peak to peak’.


a : array_like

Input values.

axis : int, optional

Axis along which to find the peaks. By default, flatten the array.

out : array_like

Alternative output array in which to place the result. It must have the same shape and buffer length as the expected output, but the type of the output values will be cast if necessary.


ptp : ndarray

A new array holding the result, unless out was specified, in which case a reference to out is returned.


>>> x = np.arange(4).reshape((2,2))
>>> x
array([[0, 1],
       [2, 3]])
>>> np.ptp(x, axis=0)
array([2, 2])
>>> np.ptp(x, axis=1)
array([1, 1])

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