Re: [R] unique columns in a matrix and number of each

Define inner as in: http://tolstoy.newcastle.edu.au/R/e4/help/08/08/19562.html and use that with identical to define an inner product: m <- matrix(c(1, 2, 1, 2, 3, 2), 2) # test matrix m colSums(inner(m, u <- unique(m,,2), identical)) u Please provide actual code to create test examples and expe

Re: [R] unique columns in a matrix and number of each

maybe there's a much simpler way to do this but here's what I got: > z [,1] [,2] [,3] [,4] [,5] [,6] [1,]114444 [2,]225555 [3,]336666 > z.unique<-unique(z,MARGIN=2) > z.unique [,1] [,2] [1,]14 [2,]25

Re: [R] unique columns in a matrix and number of each

One way is to 'paste' together the values in a column and then use 'table' to count them. 'duplicated' can probably do the same thing with the MARGIN option to find the duplicated one. You still them have to find the original ones. On Sat, Nov 22, 2008 at 3:42 PM, Salas, Andria Kay <[EMAIL PROTE