3.11.108. numpy.lib.place¶

numpy.lib.place(arr, mask, vals)[source]¶

Change elements of an array based on conditional and input values.

Similar to np.copyto(arr, vals, where=mask), the difference is that place uses the first N elements of vals, where N is the number of True values in mask, while copyto uses the elements where mask is True.

Note that extract does the exact opposite of place.

Parameters:	arr : array_like Array to put data into. mask : array_like Boolean mask array. Must have the same size as a. vals : 1-D sequence Values to put into a. Only the first N elements are used, where N is the number of True values in mask. If vals is smaller than N it will be repeated.

See also

copyto, put, take, extract

Examples

>>> arr = np.arange(6).reshape(2, 3)
>>> np.place(arr, arr>2, [44, 55])
>>> arr
array([[ 0,  1,  2],
       [44, 55, 44]])