Convert a GeoDa spatial weights object to a Matrix object

```
# S3 method for class 'Weight'
as.matrix(x, rownames = NULL, rownames.value = NULL, ...)
```

- x
A weights object

- rownames
optional, a single column name or column number to use as the rownames in the returned matrix. If TRUE the key of the data.table will be used if it is a single column, otherwise the first column in the data.table will be used.

- rownames.value
optional, a vector of values to be used as the rownames in the returned matrix. It must be the same length as nrow(x).

- ...
Required to be present because the generic `as.matrix` generic has it. Arguments here are not currently used or passed on by this method.

A matrix object