Samir, can you give an example for the use of sed?
On Sun, 30 May 2004, Samir Mishra wrote: > If the data file is in text format, is large with a lot of "."s, use sed. > It's MUCH faster than any other tool for this sort of thing. > > -----Original Message----- > From: Yong Wang [mailto:[EMAIL PROTECTED] > Sent: Sunday, May 30, 2004 05:25 > To: [EMAIL PROTECTED] > Subject: [R] how to remove "." or replace it with NA? > > > Hi,all > a quick question > A larger file include many"." (stands for missing > value) for variable, say, x. after > read in the file and assign it another name such as : > > x1<-data$x > > but x1 is always a facotor but not numerical. > > so How can I get a numeric vector from the read in data frame. > how can I replace those "." with "NA" to perform analysis. > > thank you very much > best regards > > ______________________________________________ > [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
