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 on an efficient way of doing this? I considered using apply, but was not successful. Many thanks again and best wishes, Ranjan
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