# wcovar {#wcovar}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`wcovar(X, Y, weights)`

## Arguments {#arguments}

**X**, **Y** and **weights** are vectors of the same size.

## Details {#details}

Calculate the weighted covariance of *X* and *Y* with weights as the weight vector.

## Examples {#examples}

```
x=7 4 5 8 9 3 3 5 2 6 12 1 0 -5 32
y=1.1 7 8 9 9 5 4 8.6 2 1 -9 -3 5 8 13
wt=iterate(1,0.9,x.size())
wcovar(x,y,wt);

// output: 4.201899
```

