[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



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