%% Filter Norms
% Compute the 2-norm of a Butterworth IIR filter with tolerance 10^{-10}. Specify a normalized cutoff frequency of 0.5\pi rad/s and a filter order of 5.

[b,a] = butter(5,0.5);
L2 = filternorm(b,a,2,1e-10)

%
% Compute the infinity-norm of an FIR Hilbert transformer of order 30 and normalized transition width 0.2\pi rad/s.

b = firpm(30,[.1 .9],[1 1],'Hilbert');
Linf = filternorm(b,1,inf)

% Copyright 2015 The MathWorks, Inc.