How about:
1 2 3 4 5 6
let swapRows (mat : 'a Matrix) r1 r2 =
mat.PermuteRows (fun i -> if i = r1 then r2 elif i = r2 then r1 else i)
let m1 = matrix [[1.;2.;3.];[4.;5.;6.];[7.;8.;9.]]
let m2 = swapRows m1 0 2I tried this on 1.9.7.8. Apologies if it doesn't port to F# 2.0.
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Is there a simple way to swap rows in a Matrix? I don't know how and the only way I can think of is to do an element by element copy where I check for the rows I'm swapping.