Re: [R] duplicated rows of a matrix

I need that duplicated indicate all row indices (occurences) that are duplicated. In your example, rows 2,3,4,5,8 Thanks. Carol On Monday, July 21, 2014 9:17 PM, William Dunlap wrote: Can you give an example of duplicated() not working on the rows of a matrix? Here is an example where i

Re: [R] duplicated rows of a matrix

duplicated(x), for vector or matrix x, flags any value (row for matrices) previously seen in x. To flag all duplicated values (rows for matrices) you can use the following allDups() function. allDups <- function(x) duplicated(x) | duplicated(x, fromLast=TRUE) > In your example, rows 2,3,4,5,8

Re: [R] duplicated rows of a matrix

Can you give an example of duplicated() not working on the rows of a matrix? Here is an example where it does work: > m <- cbind(c(a=1,b=2,c=3,d=2,e=3,f=4,g=1,h=1), c(11,13,11,13,11,13,13,11)) > class(m) [1] "matrix" > m [,1] [,2] a1 11 b2 13 c3 11 d2 13 e3 11 f