Multiply a Matrix by a Vector
Multiply the rows or columns of a matrix by the elements of a vector.
matvec(M, v) vecmat(v, M)
M |
numeric matrix, or object which can be coerced to a matrix. |
v |
numeric vector, or object which can be coerced to a vector. Length should match the number of columns of |
matvec(M,v) is equivalent to M %*% diag(v) but is faster to execute.
Similarly vecmat(v,M) is equivalent to diag(v) %*% M but is faster to execute.
A matrix of the same dimensions as M.
Gordon Smyth
A <- matrix(1:12,3,4) A matvec(A,c(1,2,3,4)) vecmat(c(1,2,3),A)
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