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st: spmat memory considerations, datatype for banded matrix
From
[email protected] (Rafal Raciborski, StataCorp)
To
[email protected]
Subject
st: spmat memory considerations, datatype for banded matrix
Date
Wed, 10 Jul 2013 11:12:49 -0500
Laszlo Sandor <[email protected]> has some questions about the user-written
-spmat- command:
> I had a plan to do some social network analysis on a large family tree
> of 9 million people (with Stata/MP 12.1), but if I'm doing my sums right,
> the memory needs are enormous...
Mata matrices are stored in double precision, thus with a band of 20 Laszlo
would still need close to 1.5Gb of storage space,
. di (9000000*21*8) / 2^30
1.4081597
> Can I at least save some space with using only bits for each
> connection? (I do not weight be distance.)
At the moment, Mata does not offer bitwise manipulation capabilities.
-- Rafal
[email protected]
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