George Sakkis wrote:
> Can anyone explain this ?
>
>
>>>> import numpy as N
>>>> x = N.arange(1,6,dtype='B')
>>>> x
>>>>
> array([1, 2, 3, 4, 5], dtype=uint8)
>
>>>> N.repeat(x, N.ones(5,'H'))
>>>>
> array([1, 2, 3, 4, 5], dtype=uint8)
>
>>>> N.repeat(x, N.ones(5,'l'))
>>>>
> array([1, 2, 3, 4, 5], dtype=uint8)
>
>>>> N.repeat(x, N.ones(5,'L'))
>>>>
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File
> "/usr/local/lib/python2.4/site-packages/numpy/core/fromnumeric.py",
> line 83, in repeat
> return repeat(repeats, axis)
> TypeError: array cannot be safely cast to required type
>
It means you can't safely a value of type uint32 ('L') to a value of
type int32 ('i'). The second argument of repeat needs to be castable to
type int32.
A style note: please use the named dtypes (int32, uint32, etc) rather
than the old-style letter codes; the former is much clearer. The answer
to your question might have been immediately apparent had you been
using named dtypes.
Personally, I'd also prefer people use the "ones([n])" syntax instead
of the I-wish-it-were-deprecated-but-it's-too-much-to-hope-for "ones(n)"
syntax. T
-tim
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