[Numpy-discussion] repeat array along new axis without making a copy
Steve Schmerler
elcortogm@googlemail....
Wed Feb 15 02:25:16 CST 2012
Hi
I'd like to repeat an array along a new axis (like broadcast):
In [8]: a
Out[8]:
array([[0, 1, 2],
[3, 4, 5]])
In [9]: b=repeat(a[None,...], 3, axis=0)
In [10]: b
Out[10]:
array([[[0, 1, 2],
[3, 4, 5]],
[[0, 1, 2],
[3, 4, 5]],
[[0, 1, 2],
[3, 4, 5]]])
In [18]: id(a); id(b[0,...]); id(b[1,...]); id(b[2,...])
Out[18]: 40129600
Out[18]: 39752080
Out[18]: 40445232
Out[18]: 40510272
Can I do this such that each sub-array b[i,...] is a view and not a copy?
Background: I'm working on a container class to store trajectory-like
data. The API requires that each array has a "time axis" (axis=0 here)
along which sub-arrays are stored which may be the same in some cases.
Then, I don't want to store redundant information if possible.
Thanks!
best,
Steve
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