matrix - quickest way in R to check that all columns are identical -



matrix - quickest way in R to check that all columns are identical -

suppose have matrix 3 columns

10 10 10 8 8 8 9 9 9 7 7 7 5 5 5 4 4 4 3 3 3 6 6 6 2 2 2 1 1 1

what fastest way check columns identical? can all or identical check 2 , maintain collapsing next set there more clever?

ideally, solution independent of number of columns.

you try:

all(m1[,1]==m1) # [1] true all(m2[,1]==m2) #[1] false data m1 <- matrix(c(10:1, 10:1, 10:1), ncol=3) m2 <- cbind(m1, 11:2)

r matrix

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