[SciPy-user] partially reading a file...

Travis E. Oliphant oliphant@enthought....
Wed Aug 6 09:16:56 CDT 2008


fred wrote:
> Hi,
>
> Let's say I want to read a (binary) file which contains a nx*ny*nz array.
>
> Is it possible to read a "sub-array" from this file, ie each block of 
> (nx/4, ny/4, nz/4) for instance, without loading the whole file ?
>   
An easy way to do this which forces the operating system to do the work 
of partial loading is to use a memory mapped file as the source of the 
array (i.e. a memmap array). 

Then, selecting out a block is as simple as slicing.

-Travis



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