# xcorr

Cross correlation.

## Syntax

Rxy=xcorr(x)

Rxy=xcorr(x,y)

## Inputs

`x`- As a vector
`x`is the first signal. `y`- The second signal.

## Outputs

- Rxy
- The cross correlation.

## Examples

Vector example:

```
x = [2,3,4,5,6];
y = [4,6,7,8];
Rxy = xcorr(x,y)
```

```
Rxy = [Matrix] 1 x 8
16 38 65 94 119 88 56 24
```

```
z = [1,2;3,4;5,6;7,8];
Rxy = xcorr(z)
```

```
Rxy = [Matrix] 7 x 4
7 8 14 16
26 30 38 44
53 62 68 80
84 100 100 120
53 68 62 80
26 38 30 44
7 14 8 16
```

## Comments

When `x` is a vector and `y` is omitted, the auto-correlation of `x` is computed.

When `x` is a matrix with N columns, `y` must be omitted
and Rxy is a matrix with N^2 columns. The correlation of columns i and j of
`x` is stored in column (i-1)*N + j of `Rxy`.