Apply a function to 1-D slices along the given axis.
Execute func1d(a, *args) where func1d operates on 1-D arrays and a is a 1-D slice of arr along axis.
Parameters: | func1d : function
axis : integer
arr : ndarray
args : any
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Returns: | apply_along_axis : ndarray
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See also
Examples
>>> def my_func(a):
... """Average first and last element of a 1-D array"""
... return (a[0] + a[-1]) * 0.5
>>> b = np.array([[1,2,3], [4,5,6], [7,8,9]])
>>> np.apply_along_axis(my_func, 0, b)
array([ 4., 5., 6.])
>>> np.apply_along_axis(my_func, 1, b)
array([ 2., 5., 8.])
For a function that doesn’t return a scalar, the number of dimensions in outarr is the same as arr.
>>> b = np.array([[8,1,7], [4,3,9], [5,2,6]])
>>> np.apply_along_axis(sorted, 1, b)
array([[1, 7, 8],
[3, 4, 9],
[2, 5, 6]])