# matvec

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##### Multiply a Matrix by a Vector

Multiply the rows or columns of a matrix by the elements of a vector.

Keywords
algebra, array
##### Usage
matvec(M, v)
vecmat(v, M)
##### Arguments
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 M (for matvec) or the number of rows of M (for vecmat)
##### Details

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.

##### Value

• A matrix of the same dimensions as M.

• matvec
• vecmat
##### Examples
A <- matrix(1:12,3,4)
A
matvec(A,c(1,2,3,4))
vecmat(c(1,2,3),A)
Documentation reproduced from package statmod, version 1.4.9, License: LGPL (>= 2)

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