On Wed, May 6, 2009 at 7:45 PM, Chessxm <chessxm@gmail.com> wrote:

> First, I am wondering whether we are able to use R to generate an exe file,
> or sth that can be executable outside R?
>

Emacs creates self-contained exe files using a library called 'unexec'; this
allows all initialization, library loading, etc. to run first, then dumps
out a runnable exe image.  I don't know if anyone has worked on this for R.

Second, I am wondering whether read.csv can read a csv file with size of
> 300-400 gigabytes?


Well, R data is normally held in main memory (RAM), so it would not be
practical on normal machines to have 300-400 GB of data.  There is a
big.memory package, but I don't know anything about it.

If you want to select a small subset of the very large file to work on, you
could certainly read it in in blocks of lines and only keep the data you
care about.

         -s

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