r - Get row numbers of unique rows in a matrix -


i have matrix has unique rows , row names of unique rows only.

m <- matrix( data = c(1,1,2,1,1,2,1,1,2), ncol = 3 )

if expected row index '3' other 2 rows duplicates, use duplicated logical index , wrap which numeric index.

 which(!(duplicated(m)|duplicated(m,fromlast=true)))  #[1] 3

if consider 1st , 3rd unique rows, 

 which(!duplicated(m))

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