[Numpy-discussion] Response to PEP suggestions
Robert Kern
rkern at ucsd.edu
Thu Feb 17 14:28:16 EST 2005
Fernando Perez wrote:
> Robert Kern wrote:
>
>> Why not just do
>>
>> b = ravel(a)
>>
>> ?
>>
>> That should work in both cases just fine.
>
>
> Because I thouhgt that ravel would make a copy regardless. But I may be
> wrong, much of this is very old code, when I was just picking up
> Numeric. At the time, I felt it might be best to avoid the unnecessary
> copies if possible.
Nope.
In [1]: a = arange(8)
In [2]: a.shape = (2,4)
In [3]: a
Out[3]: NumPy array, format: long
[[0 1 2 3]
[4 5 6 7]]
In [4]: ravel(a)[3] = 10
In [5]: a
Out[5]: NumPy array, format: long
[[ 0 1 2 10]
[ 4 5 6 7]]
--
Robert Kern
rkern at ucsd.edu
"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter
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