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2012 Dec 28
4
efficiently multiply different matrices in 3-d array with different vectors?
Hello,
I have been wondering of an efficient way to do this:
I have an n x m x p array Z and a p x n matrix Y.
I want to multiply each of the n matrices with the corresponding column
vector of Y.
In other words, I am wanting to matrix multiply:
Z[i, ,] %*% Y[, i]
which will give me a (two-dimensional) array or matrix of dimension n x
p with the i'th row storing the above.
Any pointers