# matvec

From statmod v1.4.32
by Gordon Smyth

##### Multiply a Matrix by a Vector

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

##### 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`

.

##### Examples

```
# NOT RUN {
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 1.4.32, License: GPL-2 | GPL-3*

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