On Thu, 16 Oct 2008, Michael Just wrote:
Hello,
I have never used source and I am a R beginner.
Not a 'beginner' R-help poster, though. (32 posts this month so far under
this name.)
If I have text file that contains 1,000's of lines of code. Can I use
source to bring this code into R and execute the code?
Yes. But surely after you have written (or even understood) a file with
1,000's of lines of code you are no longer a 'beginner'.
Does it run the code one line at a time?
No. It parses the file and runs the parsed code one expression at a time.
Is there a best way to setup source() for maximum effieciency?
Worry about efficiency when you have to (when you are no longer a
'beginner'). Remember Jackson's Rules of Optimization (in the context of
programming):
1) Don't do it.
2) (For experts only) Don't do it yet.
But you can use other means to run large collections of code,
e.g. make a package or use Rscript.
After reading ?source() would I just do:
source("my_Rcode.txt")
Yes (most people use extension 'R' for R source, though). Note that you
have to explicitly print() in code run this way: auto-printing is not
done.
Thanks,
Michael
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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