## Name

rowregul — removing poles and zeros at infinity

## Calling Sequence

[Stmp,Ws]=rowregul(Sl,alfa,beta)

## Parameters

- Sl,Stmp
`syslin`

lists

- alfa,beta
real numbers (new pole and zero positions)

## Description

computes a postfilter `Ws`

such that `Stmp=Ws*Sl`

is proper and
with full rank `D`

matrix.

Poles at infinity of `Sl`

are moved to `alfa`

;

Zeros at infinity of `Sl`

are moved to `beta`

;

`Sl`

is a assumed to be a right invertible linear system (`syslin`

list)
in state-space representation with possibly a polynomial `D`

matrix.

This function is the dual of colregul (see function code).

## Examples

s=%s;
w=[1/s,0;s/(s^3+2),2/s];
Sl=tf2ss(w);
[Stmp,Ws]=rowregul(Sl,-1,-2);
Stmp('D') // D matrix of Stmp
clean(ss2tf(Stmp))