[julia-users] slice() instead of making a copy when accessing elements in a Matrix of Matrices

[Patrick Kofod Mogensen]

So I have a Matrix{Matrix{Float64}}, and I want to access the first Matrix, 
and multiply it by a parameter vector.

nX = 175
X = 0:1:nX-1
duM = Matrix{Float64}[[zeros(nX) -0.001*X],
                      [-ones(nX) zeros(nX)]];

Say I have a parameter Vector b = [9; 2], and want to perform uM[:, 1] = 
duM[1]*b (uM is just a nX - by - 2 Array{Float64,2}), but I don't want to 
make a copy each time. I thought maybe slice(duM, 2), slice(duM, 2, :, :) 
would work, but it doesn't really seem to do the trick. What is it exactly 
I'm missing here?

Best,
Patrick