usage: [Zz, Zp, Zg] = ncauer(Rp, Rs, n)

Analog prototype for Cauer filter.
[z, p, g]=ncauer(Rp, Rs, ws)
Rp = Passband ripple
Rs = Stopband ripple
Ws = Desired order

References:

- Serra, Celso Penteado, Teoria e Projeto de Filtros, Campinas: CARTGRAF,
1983.
- Lamar, Marcus Vinicius, Notas de aula da disciplina TE 456 - Circuitos
Analogicos II, UFPR, 2001/2002.