[Numpy-discussion] How to share memory when bArr is smaller-sized than aArr

Travis Oliphant oliphant.travis at ieee.org
Mon Aug 14 19:38:02 CDT 2006


Sebastian Haase wrote:
> Hi,
> in numarray I could do this
>   
>>>> import numarray as na
>>>> a = na.arange(10)
>>>> b = na.array(a._data, type=na.int32, shape=8)
>>>>         
>
> b would use the beginning part of a.
>
> This is actually important for inplace FFT (where in real-to-complex-fft the 
> input has 2 "columns" more memory than the output)
>
> I found that in numpy there is no shape argument in array() at all anymore !
>
>   
No, there is no shape argument anymore.  But, the ndarray() constructor 
does have the shape argument and can be used in this way.

so

import numpy as na
b = na.ndarray(buffer=a, dtype=na.int32, shape=9)

should work.

-Travis





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