%% Design a Lowpass Filter with a Peak of 4.015 dB in Passband

[num,den] = iirlpnorm(5,12,[0 .15 .4 .5 1],[0 .4 .5 1],... 
[1 1.6 1 0 0],[1 1 1 10 10])

%
% Display the magnitude response in fvtool

fvtool(num,den)

% Copyright 2012 The MathWorks, Inc.