## REPMAT Array Replication Function

Section: Array Generation and Manipulations

### Usage

The`repmat`

function replicates an array the specified
number of times. The source and destination arrays may
be multidimensional. There are three distinct syntaxes for
the `repmap`

function. The first form:
y = repmat(x,n)

replicates the array `x`

on an `n-times-n`

tiling, to create
a matrix `y`

that has `n`

times as many rows and columns
as `x`

. The output `y`

will match `x`

in all remaining
dimensions. The second form is

y = repmat(x,m,n)

And creates a tiling of `x`

with `m`

copies of `x`

in the
row direction, and `n`

copies of `x`

in the column direction.
The final form is the most general

y = repmat(x,[m n p...])

where the supplied vector indicates the replication factor in each dimension.

### Example

Here is an example of using the`repmat`

function to replicate
a row 5 times. Note that the same effect can be accomplished
(although somewhat less efficiently) by a multiplication.
--> x = [1 2 3 4] x = 1 2 3 4 --> y = repmat(x,[5,1]) y = 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

The `repmat`

function can also be used to create a matrix of scalars
or to provide replication in arbitrary dimensions. Here we use it to
replicate a 2D matrix into a 3D volume.

--> x = [1 2;3 4] x = 1 2 3 4 --> y = repmat(x,[1,1,3]) y = (:,:,1) = 1 2 3 4 (:,:,2) = 1 2 3 4 (:,:,3) = 1 2 3 4