Chebyshev

The command

chebyshev ( <order> , <ripple> ) ;

with

<order>	:	integer; order,
<ripple>	:	real; ripple in dB

results in a Chebyshev cascade filter. Its bandwidth is 1rad/s. If the ripple is zero, the bandwidth is the frequency where the damping is -3 dB. If the ripple is nonzero, the bandwidth is the highest frequency where the damping equals the ripple.