[R] locate the rows in a dataframe with some criteria

From: zhihuali <lzhtom_at_hotmail.com>
Date: Fri, 07 Mar 2008 15:50:55 +0000

Hi, netters,

This is probably a rookie question but I couldn't find the answer after hours of searching and trying.

Suppose there'a a dataframe M:

x y
10 A
13 B
8 A
 11 A

I want to locate the rows where x >=10 and y="A". I know how to do it to vectors by using which, but how to do it with the dataframe?

Thank you very much!

Zhihua Li

MSN 中文网,最新时尚生活资讯,白领聚集门户。

        [[alternative HTML version deleted]]

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 Fri 07 Mar 2008 - 15:56:18 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 Fri 07 Mar 2008 - 20:30:20 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