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BUG: shift with a negative number should fail #13898
Description
xref gh-13739
A negative shift is undefined in C. Python raises a ValueError, numpy returns the undefined values. We should at least warn, and probably raise an Error.
>>> a = np.arange(4)
>>> 10 << -1
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: negative shift count
>>> a << -1
array([-9223372036854775808, 0, -9223372036854775808,
0])
Activity
mattip commentedon Sep 18, 2023
The last example now returns
array([0, 0, 0, 0]), but should it raise?