[Numpy-discussion] bug? in len(arr.flat)

Sebastian Haase haase at msg.ucsf.edu
Wed Oct 27 09:59:02 CDT 2004


Hi,
I have a (UInt16) 3d data stack and want to get to it's underlying buffer (to 
(later) feed it into memmap) ...  
I noticed that len(pr2._flat) is half of len(pr2._data) - like it doesn't 
multiply itemsize in.
>>> pr2.shape
(40, 512, 512)
>>> pr2.flat.shape
(10485760)
>>> 512*512*40
10485760
>>> len(pr2.flat)
10485760
>>> pr2.flat._itemsize
2
>>> len(pr2._data)
20971520
>>> pr2._byteoffset
0

Is this a bug or am I missunderstanding ?

Thanks,
Sebastian Haase
  







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