regarding matrix comparison in R

Question

Currently, I have two matrixes, and want to compare it and see whether they are exactly equivalent. In R, is there any function to do that?

Answer 1

As stated above start with ?all.equal or ?identical. If you then find that your matrices are unequal, you may want to compare them column by column. This might do the trick:

mapply(as.data.frame(m1),as.data.frame(m2),FUN=function(v1,v2) all(v1==v2) )