[R] remove low frequent rows

[markleeds at verizon.net]

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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