[n,Omgc]=buttord(Omgp,Omgs,Rp,As,'s') %计算阶数n和截止频率：if nargin == 4 %如果输入变量数是4opt = 'z';elseif nargin == 5if strcmp(opt,'z') & strcmp(opt,'s')error('Invalid option for final argument.');endendmsg=freqchk(wp,ws,opt);er
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