Fix Python – Numpy: find first index of value fast


Asked By – cyborg

How can I find the index of the first occurrence of a number in a Numpy array?
Speed is important to me. I am not interested in the following answers because they scan the whole array and don’t stop when they find the first occurrence:

itemindex = numpy.where(array==item)[0][0]
nonzero(array == item)[0][0]

Note 1: none of the answers from that question seem relevant Is there a Numpy function to return the first index of something in an array?

Note 2: using a C-compiled method is preferred to a Python loop.

Now we will see solution for issue: Numpy: find first index of value fast


There is a feature request for this scheduled for Numpy 2.0.0:

This question is answered By – cyborg

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