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
