one way is the following:
col1 <- c(1,2,3,4,5,6)
col2 <- c(6,5,4,3,2,1)
m <- cbind(col1, col2)
col3 <- c(1,3,2,6)
col4 <- c(6,3,5,1)
n <- cbind(col3, col4)
ind.n <- do.call(paste, c(as.data.frame(n), sep = "\r"))
ind.m <- do.call(paste, c(as.data.frame(m), sep = "\r"))
ind.n %in% ind.m
I hope it helps.
Best,
Dimitris
On 9/27/2010 8:00 PM, xinxin xx wrote:
Hi everyone:
I have a kinda easy question but i do not know how to solve that in a simple
way.
I want to compare the rows of two matrices.
col1<- c(1,2,3,4,5,6)
col2<- c(6,5,4,3,2,1)
m<- cbind(col1, col2)
col3<- c(1,3,2,6)
col4<- c(6,3,5,1)
n<- cbind(col3, col4)
In matrix n, for example the first row is (1,6), it is also some row in matrix m, i
want the code results "TRUE". then for the 2nd row (3,3), it should be FALSE.
So in this case it should be (TRUE, FALSE, TRUE, TRUE)
I tried %in% or is.element for a row in n and matrix m, but it does not work.
I think I can also write two loops to compare the rows of m and n one by
one, but it takes a long time to run.
Could anyone tell me how to solve this?
Thank you very much!!
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--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
