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
On Mar 7, 2008, at 10:50 AM, zhihuali wrote:
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
Hi Zhihua,
M - data.frame (x=c(10, 13, 8, 11), y=c('A', 'B', 'A', 'A'))
which (M$x = 10 M$y == 'A')
# [1] 1 4
Hope it helps,
Nael
2008/3/7 N. Lapidus [EMAIL PROTECTED]:
Hi Zhihua,
M - data.frame (x=c(10, 13, 8, 11), y=c('A', 'B', 'A', 'A'))
which (M$x = 10 M$y == 'A')
# [1] 1 4
Hope
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