aeex4.m

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format short e                 % Set display format
n = 3;                         % Define order
Wn = 1;                        % Prototype bandwidth 
Wo = 2*pi*150;                 % Specify new bandwidth
[b,a] = butter(n,Wn,'s');      % Prototype coefficients
[b1,a1] = lp2lp(b,a,Wo);       % Convert bandwidth
b1                             % Numerator coefficients 
a1                             % Denominator coefficients         
%
% Check on previous results.
%
[b2,a2] = butter(n,Wo,'s');    % Determine coefficients
b2                             % Numerator coefficients
a2                             % Denominator coefficients