5 Apr
2001
5 Apr
'01
5:15 p.m.
On Fri, 6 Apr 2001, Tom Pledger wrote:
If you're adding every element of the first list to every element of the second list, it's sometimes called diagonalisation.
I do not know where this definition came from but it does not make sense to me. It is zipping that looks like a diagonalization, not the other way around. [f ai bj | ai <- a, bj <- b] This looks like an outer product of two vectors, or a matrix represented as a linear vector of dimension n x m, where n = length a, m = length b. If f = (*) then it is really the outer product. [ai * bj | (ai, bj) <- zip a b] But this is a list of diagonal elements of the outer product above, providing that n == m. Jan