Hello,
I have never used source and I am a R beginner. 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? Does it run the code one line at a time? Is there a
best way to setup source() for maximum effieciency? After reading ?source()
would I just do:
source("my_Rcode.txt")
Thanks,
Michael
[[alternative HTML version deleted]]
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 > > [[alternative HTML version deleted]]After so many postings, please do follow the posting guide. (No HTML.)> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.-- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
On Thu, Oct 16, 2008 at 1:42 AM, Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:> > 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.)I hope this isn't bad form on my part. My thought was beginners may need the most help and therefore post the most. I hope my name or posts won't cause fatigue.> >> 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'.I think I am still a beginner, hence all the questions. I am pretty sure my code has redundancies and I use excel as an text editor, its the fastest way I know how (lots of "dragging formulas"). I have 1,000's because I have 1000's of locations in my dataset and I am running a few regressions on each. I think that this 1,000's of lines R code should not discredit my 'beginner' status. I am still just using univariate statistics and learning how to do EDA in R.> >> 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. >Thank you.> >> 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. >Thanks, I had to look up Jackson's Rules of Optimization. I asked about efficiency to make sure that I wasn't suggesting to do something totally ridiculous. The only 'programming' I do is for R and this is partly why I have so many questions and furthermore posts. I came to R after using Excel or Systat for statistical analysis.> 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 for .R and print() tips. I would not have done those.> >> >> Thanks, >> Michael >> >> [[alternative HTML version deleted]] > > After so many postings, please do follow the posting guide. (No HTML.)Thanks for bringing this to my attention.