Create a matrix filled with zeros.

```
zeros(
```*3*)

h | Height of the matrix. |

w | Width of the matrix (optional). If not given, assumed to be the same as the height. |

return value | A matrix filled with zeros. |

The numbery of parameters can vary:

0 - Returns 0.

1 - Returns a square matrix with size determined by the argument.

2 - Returns a rectangular matrix with size determined by arguments.