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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