linf infinity norm

## Syntax

                linf(g)
                linf(g, eps)
                linf(g, eps, tol)

## Arguments

g

  is a `syslin` linear system.

eps

  is error tolerance on n.

tol

  threshold for imaginary axis poles.

## Description

returns the L_infinity norm of `g`: `n = sup_w(sigmax(g(j.w)))`

(sigmax largest singular value).

## See also

- h_norm
- linfn