File mttroot/mtt/lib/control/PPP/butterworth_matrix.m artifact c40a4036f0 part of check-in 543de8091c
function A = butterworth_matrix (n,p) ## usage: A = butterworth (n,p) ## ## A-matrix for generating nth order Butterworth functions with parameter p ## Copyright (C) 2000 by Peter J. Gawthrop ## Butterworth poly pol = ppp_butter(n,p); ## Create A matrix (controller form) A = [-pol(2:n+1) eye(n-1) zeros(n-1,1)]; endfunction