DF<-cbind(c("a","b","a"),c(4,3,6))
DF[(DF[,1] %in% names(which(table(DF[,1]) >= 2))),]
On Sun, Aug 31, 2008 at 2:19 AM, Yuan Jian wrote:
Hi,
�
I have a matrix.
a<-cbind(c("a","b","a"),c(4,3,6))
���� [,1] [,2]
[1,] "a"� "4" [2,] "b"� "3" [3,] "a"� "6"
I want to remove rows in matrix a whose first column has frequency
less than 2.
in about example matrix a becomes
���� [,1] [,2]
[1,] "a"� "4" [2,] "a"� "6"
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