[R] operations on all pairs of columns from two matrices

[Stephen Tucker]

how about this?

m1 <- matrix(rep(1:3,each=5),ncol=3)
m2 <- matrix(1:15,ncol=3)

array(apply(m1,2,function(x,m) m-x,m2),dim=c(dim(m2),ncol(m1)))


----- Original Message ----
From: Daren Tan <daren76 at hotmail.com>
To: r-help at stat.math.ethz.ch
Sent: Wednesday, June 18, 2008 7:36:45 AM
Subject: [R] operations on all pairs of columns from two matrices



m1 <- matrix(rnorm(40), ncol=4)
m2 <- matrix(rnorm(40), ncol=4)

I would like to subtract first column of m1 from all columns of m2, subtract 2nd of m1 from all columns of m2, and so on. Obviously, I am not using the appropriate function outer(m1, m1, "-"), since the first column isn't all 0s. 

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