Thanks to all, appreciated!
On Thu, Feb 24, 2011 at 11:18 AM, Jonathan P Daily <jda...@usgs.gov> wrote:
> See inline below.
> --------------------------------------
> Jonathan P. Daily
> Technician - USGS Leetown Science Center
> 11649 Leetown Road
> Kearneysville WV, 25430
> (304) 724-4480
> "Is the room still a room when its empty? Does the room,
> the thing itself have purpose? Or do we, what's the word... imbue it."
> - Jubal Early, Firefly
>
> r-help-boun...@r-project.org wrote on 02/24/2011 01:23:54 PM:
>
> > [image removed]
> >
> > [R] create dummy variables by for loop
> >
> > Changbin Du
> >
> > to:
> >
> > <r-help@r-project.org>
> >
> > 02/24/2011 01:25 PM
> >
> > Sent by:
> >
> > r-help-boun...@r-project.org
> >
> > HI, Dear R community,
> >
> > I try to create 100 dummy variables like the following:
> >
> > ack$id_1 <- (ack$ID==1)*1
> > ack$id_2 <- (ack$ID==2)*1
> > ..
> > .
> > ack$id_100 <- (ack$ID==100)*1
> >
> >
> > I used the following codes:
> >
> > for(i in 1:100){
> > ack$id_[i] <- (ack$ID==i)*1
> > }
> This doesn't do what you think it does. when i = 1, it assigns the result
> of (ack$ID==1)*1 to the first element of ack$id_
>
> If you want ack$id_i to be created, try:
>
> ack[[paste("id", i, sep = "_")]] <- (ack$ID==i)*1
>
>
> >
> > But only one column is created, can anyone help me?
> >
> > Thanks a lot!
> >
> >
> > --
> > Sincerely,
> > Changbin
> > --
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> > and provide commented, minimal, self-contained, reproducible code.
>
>
--
Sincerely,
Changbin
--
Changbin Du
DOE Joint Genome Institute
Bldg 400 Rm 457
2800 Mitchell Dr
Walnut Creet, CA 94598
Phone: 925-927-2856
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and provide commented, minimal, self-contained, reproducible code.
