On Thu, Sep 18, 2008 at 1:39 PM, Michael A. Gilchrist <[EMAIL PROTECTED]> wrote: > Wow, that's elegant and simple. It's also faster than my approach. > > NB, you don't need to use close(), read.delim() closes the pipe when its > done reading.
If read.delim() close the connection in this case, it's a bug. It should only close the connection if it opens it. /Henrik > > Thank you all for your suggestions, they really helped me with this problem > and understand R just a bit better. > > Sincerely, > > Mike > ----------------------------------------------------- > Department of Ecology & Evolutionary Biology > 569 Dabney Hall > University of Tennessee > Knoxville, TN 37996-1610 > > phone:(865) 974-6453 > fax: (865) 974-6042 > > web: http://eeb.bio.utk.edu/gilchrist.asp > ----------------------------------------------------- > > > On Fri, 12 Sep 2008, Prof Brian Ripley wrote: > >> Why not use >> >> con <- pipe(COMMAND) >> foo <- read.delim(con, colClasses="numeric") >> close(con) >> >> ? See the 'R Data Input/Output Manual'. >> >> On Fri, 12 Sep 2008, Michael A. Gilchrist wrote: >> >>> Hello, >>> >>> I am currently using R to run an external program and then read the >>> results the external program sends to the stdout which are tsv data. >>> >>> When R reads the results in it converts it to to a list of strings which >>> I then have to maniuplate with a whole slew of commands (which, figuring out >>> how to do was a reall challenge for a newbie like myself)--see below. >>> >>> Here's the code I'm using. COMMAND runs the external program. >>> >>> rawInput= system(COMMAND,intern=TRUE);##read in tsv values >>> rawInput = strsplit(rawInput, split="\t");##split elements w/in the >>> list >>> ##of character strings by >>> "\t" >>> rawInput = unlist(rawInput); ##unlist, making it one long vector >>> mode(rawInput)="double"; ##convert from strings to double >>> finalInput = data.frame(t(matrix(rawInput, nrow=6))); ##convert >>> >>> Because I will be doing this 100,000 of times as part of an optimization >>> problem, I am interested in learning a more efficient way of doing this >>> conversion. >>> >>> Any suggestions would be appreciated. >>> >>> >>> Thanks in advance. >>> >>> Mike >>> >>> >>> ----------------------------------------------------- >>> Department of Ecology & Evolutionary Biology >>> 569 Dabney Hall >>> University of Tennessee >>> Knoxville, TN 37996-1610 >>> >>> phone:(865) 974-6453 >>> fax: (865) 974-6042 >>> >>> web: http://eeb.bio.utk.edu/gilchrist.asp >>> >> >> -- >> Brian D. Ripley, [EMAIL PROTECTED] >> 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 >> > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
