On Mar 13, 2012, at 7:02 PM, Folkes, Michael wrote:
Hello all,
I was under the (false?) assumption that an object that is class
logical, would take up less memory than an object with class integer.
Nope.
Below am I correctly showing this is not the case?
This was an attempt to reduce memory usage.
I think there is a package that will do bitwise operations. Yep... all
we needed to do is look:
http://finzi.psych.upenn.edu/R/library/bitops/html/00Index.html
I'm dealing with two large
arrays (could be integers). Their contents are the exact same, but
one
has NA's in random locations. I thought instead of having the second
array as an integer, it could be logical and the TRUE vs FALSE could
be
used to update data in the first array. (but even this idea may be
weak
if I just end up with a third temporary array...)
You probably would since any assignment is going to create a copy. And
even having a bitwise logical option wouldn't necessarily help since
the indexing would be of necessity either integer or logical (both 8
bit values).
I'm running win xp sp3, "R version 2.14.1 (2011-12-22)".
31-bit addressing constraints as well? (That's so last decade.) You
aren't making life easy for yourself are you.
--
David Winsemius, MD
West Hartford, CT
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