If you know what 10 rows to read, then you can 'skip' to them, but it the system still has to read each line at a time.
I have a 200,000 line csv file of numerics that takes me 4 seconds to read in with 'read.csv' using 'colClasses', so I would guess your 100K line file would take half of that. Is 2 seconds of time a waste of resources? On 3/11/07, Wensui Liu <[EMAIL PROTECTED]> wrote: > > Jim, > > Glad to see your reply. > > Refering to your email, what if I just want to read 10 rows from a csv > table with 100000 rows? Do you think it a waste of resource to read > the whole table in? > Anything thought? > > wensui > > On 3/11/07, jim holtman <[EMAIL PROTECTED]> wrote: > > Why cann't you read in the whole data set and then create the > subsets? This > > is easily done with 'split'. If the data is too large, then consider a > data > > base. > > > > On 3/11/07, gnv shqp <[EMAIL PROTECTED]> wrote: > > > > > > Hi R-experts, > > > > > > I have data from four conditions of an experiment. I tried to create > four > > > subsets of the data with read.table, for example, > > > read.table("Experiment.csv",subset=(condition=="1")) > > > . I found a similar post in the archive, but the answer to that post > was > > > no. Any new ideas about reading subsets of data with read.table? > > > > > > Thanks! > > > > > > Feng > > > > > > [[alternative HTML version deleted]] > > > > > > ______________________________________________ > > > R-help@stat.math.ethz.ch 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. > > > > > > > > > > > -- > > Jim Holtman > > Cincinnati, OH > > +1 513 646 9390 > > > > What is the problem you are trying to solve? > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@stat.math.ethz.ch 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. > > > > > -- > WenSui Liu > A lousy statistician who happens to know a little programming > (http://spaces.msn.com/statcompute/blog) > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch 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.