h2norm H2 norm of a continuous time proper dynamical system

## Syntax

              n = h2norm(Sl)
              n = h2norm(Sl, tol)

## Arguments

Sl

  Proper linear dynamical system in non-discrete (continuous or undefined) time domain

n

  real scalar

## Description

produces the H2 norm of a linear continuous time system `Sl`.

(For `Sl` in state-space form `h2norm` uses the observability gramian and for `Sl` in transfer form `h2norm` uses a residue method)

## Examples

        s = %s;
        h = syslin('c',(2*0.9*10*s+100) / (s^2+2*0.3*10.1*s+102.01));
        h2norm(h)

## History

5.4.0 `Sl` is now checked for non-discrete (continuous or undefined) time linear dynamical system.