sam_in_zdomain.m

很多matlab的源代码

figure('position',[10 10 800 500],'name','z域采样');
axes('position',[0.1 0.5 0.65 0.4]);
N=5;
k=0:1:N-1;
wk=2*pi*k/N;
zk=exp(j*wk);
Xk=(zk)./(zk-0.7);
xn=real(idfs(Xk,N));
xtilde=xn'*ones(1,40/N);
xtilde=(xtilde(:))';
subplot(2,2,1);
h=stem(0:39,xtilde);
set(h,'LineWidth',2);
set(h,'MarkerSize',2);
%axis(0,40,-0.1,1.5)
xlabel('n');
ylabel('xtilde(n)');
title('N=5')
g1=uicontrol('style','text',...
'position',[650 450 100 20],...
'string','请选择N值');
g2=uicontrol('style','popupmenu',...
'position',[650 410 100 20],...
'string','5|10|20|40');
zz={'x(n) = (0.7)^n*u(n);'
    '例：'
    'N=5;k=0:1:N-1;'
    'wk=2*pi*k/N;'
    'zk=exp(j*wk);'
    'Xk=(zk)./(zk-0.7);'
    ' xn=real(idfs(Xk,N));'
    'xtilde=xn‘*ones(1,40/N);'
    'xtilde=(xtilde(:))’ '};
g3=uicontrol('style','listbox',...
'position',[100 40 400 170],...
'string',zz,...
'max',2);
g4=uicontrol('style','text',...
'position',[100 210,40 15],...
'string','说明：');
Hc_close=uicontrol(gcf,'style','push',...
'position',[650 80 100 25],...
'string','Close',...
'Callback','Close');
set(g2,'callback','dd');