Displaying 1 result from an estimated 1 matches for "3424129d".
2008 Mar 07
4
locate the rows in a dataframe with some criteria
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