# Specify and Implement Restrictions on the Location Parameters¶

## Description¶

`restrictor`

creates a linear transformation that maps a small set of linearly
unrestriced parameters to a larger set of linearly restricted parameters.

`set.parms.free`

specifies a call to `restrictor`

in which only the specified
parameters are allowed to differ from zero.

## Usage¶

```
restrictor(C,d=numeric(m),sign=7)
set.parms.free(...)
```

## Arguments¶

`C`

The matrix involved in the linear restriction .

`d`

The vector involved in the linear restriction .

`sign`

The number of significant digits to use for rounding to compensate finite machine precision in computing the QR decomposition.

`...`

several character vector arguments. Each character vector corresponds to one of the axes of the latent space, and each character string in a vector corresponds to the name of a policy objective that can obtain coordinate values different from zero.

## Value¶

The values of these functions are for internal use only.

If then . The function `restrictor`

returns a
list with the elements “reduction” (which equals ) and “offset” (which equals
)

The function `set.parms.free`

returns a function that generates arguments and
with which the `restrictor`

is called inside of the function `latpos`

.