Round a number to the nearest $ <= $ integer.

```
floor(
```*2.1*)

num | The input. |

return value | The nearest, but smaller or equal integer to the input. |

The argument can be a real or complex number or a matrix. In case of complex numbers the real and
imaginary parts are handled separately. In case of matrices, the computation is elementwise.**Quantities are not suppored by this function.**

```
floor(
```*2*)