The sqldf package can read in a column without reading the entire file into R. It will automatically set up a database for you read the file into the database (all this without going through R) and then it will extract the column you want. You will need two statements. One to define which file to use and one to read in the file and extract the column. See example 6b on the sqldf home page: http://sqldf.googlecode.com
On Sun, May 3, 2009 at 1:36 PM, Wensui Liu <[email protected]> wrote: > Sometimes, it is too costly to read the whole data file into R. > I am looking for solution in scan() and read.Lines() but don't they work. > Thank you so much! > -- > ============================== > WenSui Liu > Acquisition Risk, Chase > Blog : statcompute.spaces.live.com > > Tough Times Never Last. But Tough People Do. - Robert Schuller > > ______________________________________________ > [email protected] 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. > ______________________________________________ [email protected] 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.
