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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