load sumsin;
s=sumsin;
figure(1);
subplot(6,1,1);
plot(s);
Ylabel('s');
title('原始信號和各層近似');
[c,l]=wavedec(s,5,'db3');
for i=1:5
   decom=wrcoef('a',c,l,'db3',6-i);
   subplot(6,1,i+1);
   plot(decom);
   Ylabel(['a',num2str(6-i)]);
end
figure(2);
subplot(6,1,1);
plot(s);
Ylabel('s');
title('原始信號和各層細(xì)節(jié)');
[c,l]=wavedec(s,5,'db3');
for i=1:5
   decom=wrcoef('d',c,l,'db3',6-i);
   subplot(6,1,i+1);
   plot(decom);
   Ylabel(['d',num2str(6-i)]);
end