[Numpy-discussion] numpy slices limited to 32 bit values?

Charles R Harris charlesr.harris@gmail....
Sun May 17 10:14:40 CDT 2009

On Sun, May 17, 2009 at 8:51 AM, Charles R Harris <charlesr.harris@gmail.com
> wrote:

> Hi Glen,
> On Sat, May 16, 2009 at 11:24 PM, Glenn Tarbox, PhD <glenn@tarbox.org>wrote:
>> Today at Sage Days we tried slices on a few large arrays (no mmap) and
>> found that slicing breaks on arrays somewhere between 2.0e9 and 2.5e9
>> elements.  The failure mode is the same, no error thrown, basically nothing
>> happens
>> This was on one of the big sage machines. I don't know the specific OS /
>> CPU but it was definitely 64 bit and lots of available memory etc.
> Can you try slicing with an explicit upper bound? Something like a[:n] = 1,
> where n is the size of the array.

And maybe some things like  a[n:n+1] = 1, which should only set a single
element and might save some time ;)

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