[R] R Memory Usage Concerns

Evan Klitzke evan at eklitzke.org
Tue Sep 15 06:30:21 CEST 2009

On Mon, Sep 14, 2009 at 8:58 PM, Eduardo Leoni <leoniedu at msu.edu> wrote:
> And, by the way, factors take up _more_ memory than character vectors.
>> object.size(sample(c("a","b"), 1000, replace=TRUE))
> 4088 bytes
>> object.size(factor(sample(c("a","b"), 1000, replace=TRUE)))
> 4296 bytes

I think this is just because you picked short strings. If the factor
is mapping the string to a native integer type, the strings would have
to be larger for you to notice:

> object.size(sample(c("a pretty long string", "another pretty long string"), 1000, replace=TRUE))
8184 bytes
> object.size(factor(sample(c("a pretty long string", "another pretty long string"), 1000, replace=TRUE)))
4560 bytes

Evan Klitzke <evan at eklitzke.org> :wq

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