# corr

Compute correlation coefficients.

## Syntax

c = corr(x)

c = corr(x,y)

## Inputs

`x`- Data sample.
`y`- Data sample.

## Outputs

- c
- Correlation coefficient.

## Example

```
a=[1,2,3,4;1,4,9,16;16,9,4,1;1,8,27,64];
b=[2,3,4;4,9,16;8,27,64;16,9,4];
c=corr(a,b)
```

```
c = [Matrix] 4 x 3
0.053838 0.96225 0.9802
0.774 0.78633 0.61452
0.8863 -0.21581 -0.44596
0.85931 -0.28643 -0.51024
```

## Comments

When x is a matrix c=corr(x) computes matrix c such that c(i,j) is the correlation coefficient
of columns i and j of `x`.

When x and y are vectors c=corr(x,y) computes the correlation coefficient of the vectors.

When x and y are matrices c=corr(x,y) computes matrix c such that c(i,j) is the correlation coefficient
of column i of `x` and column j of `y`.