Dear Spenser et al., sed stands for "string editor," I believe, and it is a Unix utility, although there are implementations for other OS's including Windows.
For Yong Wang's problem, I think that it is more natural to use the na.strings argument to read.table(), as I previously suggested, than to edit the data file. Regards, John > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Spencer Graves > Sent: Sunday, May 30, 2004 11:23 AM > To: Yong Wang > Cc: [EMAIL PROTECTED]; Samir Mishra > Subject: Re: [R] how to remove "." or replace it with NA? > > It's apparently a unix command; www.r-project.org -> > search -> "R site search" -> sed produced at least one hit > with the following example: > > scan(pipe("sed -e s/,$// data2"), sep=",") > > For the rest of this comment, see the R site search. > hope this helps. spencer graves > > Yong Wang wrote: > > >Samir, can you give an example for the use of sed? > > > > > > > >On Sun, 30 May 2004, Samir Mishra wrote: > > > > > > > >>If the data file is in text format, is large with a lot of > "."s, use sed. > >>It's MUCH faster than any other tool for this sort of thing. > >> > >>-----Original Message----- > >>From: Yong Wang [mailto:[EMAIL PROTECTED] > >>Sent: Sunday, May 30, 2004 05:25 > >>To: [EMAIL PROTECTED] > >>Subject: [R] how to remove "." or replace it with NA? > >> > >> > >>Hi,all > >>a quick question > >>A larger file include many"." (stands for missing > >>value) for variable, say, x. after > >>read in the file and assign it another name such as : > >> > >>x1<-data$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 > > > > > > ______________________________________________ > [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
