Re: [R] how to read data from table based a condition

From: Marc Moragues <marc.moragues_at_gmail.com>
Date: Thu, 10 Apr 2008 09:18:42 +0000 (UTC)

Xin <jasonshi510 <at> hotmail.com> writes:

>
> y<-data[,7]
> x<-data[,3]
>
> I want to know the mean of y if corresponding x=1.
>

Try this:

mean(data[data[,3]==1,data[,7])

You can also look at ?subset.



R-help_at_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 and provide commented, minimal, self-contained, reproducible code. Received on Thu 10 Apr 2008 - 09:22:36 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Thu 10 Apr 2008 - 10:30:27 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive