Question
Expand numpy array to be able to broadcast with second array of variable depth
I have a function which can take an np.ndarray
of shape (3,)
or (3, N)
, or (3, N, M)
, etc.. I want to add to the input array an array of shape (3,)
. At the moment, I have to manually check the shape of the incoming array and if neccessary, expand the array that is added to it, so that I don't get a broadcasting error. Is there a function in numpy
that can expand my array to allow broadcasting for an input array of arbitrary depth?
def myfunction(input_array):
array_to_add = np.array([1, 2, 3])
if len(input_array.shape) == 1:
return input_array + array_to_add
elif len(input_array.shape) == 2:
return input_array + array_to_add[:, None]
elif len(input_array.shape) == 3:
return input_array + array_to_add[:, None, None]
...
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