pen2ea pencil to E,A conversion

## Syntax

    [E,A]=pen2ea(Fs)

## Arguments

Fs

  matrix pencil `s*E-A`

E,A

  two matrices such that `Fs=s*E-A`

## Description

Utility function. Given the pencil `Fs=s*E-A`, returns the matrices `E` and `A`.

## Examples

    E=[1,0];A=[1,2];s=poly(0,'s');
    [E,A]=pen2ea(s*E-A)