[Numpy-discussion] Striding on NumArray objects
Francesc Altet
faltet at carabos.com
Tue Dec 21 05:08:01 EST 2004
Hi,
I'm a bit lost with the next example:
In [28]: from numarray import *
In [29]: a=arange(10)
In [30]: a.iscontiguous()
Out[30]: 1
In [31]: b=a[::2]
In [32]: b.iscontiguous()
Out[32]: 0
That seems to suggest that b shares the same data buffer than a. Indeed:
In [36]: a._data
Out[36]: <memory at 0x082494d8 with size:0x00000028 held by object 0xb762c260 aliasing object 0x00000000>
In [37]: b._data
Out[37]: <memory at 0x082494d8 with size:0x00000028 held by object 0xb762c260 aliasing object 0x00000000>
At this point, I believe that _bytestride should be different on both
arrays, but:
In [33]: a._bytestride
Out[33]: 4
In [34]: b._bytestride
Out[34]: 4
while I expected to find b._bytestride equal to 8.
Is that an error or a lack of understanding on my part?
Cheers,
--
Francesc Altet >qo< http://www.carabos.com/
Cárabos Coop. V. V V Enjoy Data
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