John wrote:
> hi,
>
> why does the ValueError appear below,
because python short circuits this expression, and numpy can't overwrite
that -- the same reason a and b doesn't work for a and b arrays.
> and how can i make that 2<a<5
> expression work when a is an array?
>>> (a > 2) & (a < 5)
array([[False, False, False],
[ True, True, False],
[False, False, False]], dtype=bool)
& is the bitwise-and, which is overridden by numpy, and works like and
for boolean data.
-Chris
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