On 1 May 2004 at 16:35, Vadim Ogranovich wrote: > Unfortunately, seek only works in terms of bytes not lines and I only > know how many lines I need to skip, but not bytes. >
read.table() has a skip= agrument (probably also has scan() ) Kjetil Halvorsen > > -----Original Message----- > From: Gabor Grothendieck [mailto:[EMAIL PROTECTED] > Sent: Saturday, May 01, 2004 3:44 PM > To: [EMAIL PROTECTED] > Subject: Re: [R] skip lines on a connection > > > > > ?seek > > Vadim Ogranovich <vograno <at> evafunds.com> writes: > > : > : Hi, > : > : I am looking for an efficient way of skipping big chunks of lines on > a : connection (not necessarily at the beginning of the file). One way > is to : use read lines, e.g. readLines(1e6), but a) this incurs the > overhead of : construction of the return char vector and b) has a > (fairly remote) : potential to blow up the memory. : : Another way > would be to use scan(), e.g. : : scan(con, skip=1e6, nmax=0) : : but > somehow this doesn't work: : : > scan(con, skip=10, nmax=0) : Error in > scan(con, skip = 10, nmax = 0) : : "scan" expected a real, got > "A;12;0;" : : I can stick to readLines, but am curious if there is a > better way. : : I use R-1.8.1 on RH-7.3. : : Thanks, : Vadim > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
