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rowbind
2010 Nov 25
4
how to find a row index in a matrix or a data frame ?
Dear all,
this looks pretty much a standard problem, but I couldn't find a
satisfying and understandable solution.
(A) Given a data frame (or matrix), e.g.
x <- data.frame(A=c(1, 2, 2), B=c(4, 5, 5))
and a row of this data frame, e.g.
r <- c(2, 5)
I need to find one row index i (or all such indices) such that r
is at the i-th row in x, that is, the