generalized cumulative functions in NumPy/SciPy?

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The ValueError above is still a bug using Numpy 1.20.1 (with Python 3.9.1).

Luckily a workaround was discovered that uses casting:
https://groups.google.com/forum/#!topic/numpy/JgUltPe2hqw

import numpy as np
uadd = np.frompyfunc(lambda x, y: x + y, 2, 1)
uadd.accumulate([1,2,3], dtype=object).astype(int)
# array([1, 3, 6])

Note that since the custom operation works on an object type, it won’t benefit from the efficient memory management of numpy. So the operation may be slower than one that didn’t need casting to object for extremely large arrays.

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