Question

matlab小波分解与重构

要进行小波分解与重构，程序有问题，不知道怎么办？
[c1 c2 c3] =textread('testdata.txt','%f%f%f');
num=1:6000;
s=[c1(num), c2(num)];
%b=[c1(num), c3(num)];
subplot(2,2,1);plot(s); title('原始信号');

[c,l]=wavedec(s,3,'db1');
a3=appcoef(c,l,'db1',3);
d3=detcoef(c,l,3);
d2=detcoef(c,l,2);
d1=detcoef(c,l,1);
dd3=zeros(1,length(d3));
dd2=zeros(1,length(d2));
dd1=zeros(1,length(d1));
c1=[a3 dd3 dd2 dd1];
s1=waverec(c1,l,'db1');
subplot(2,2,2);
plot(s1);grid;
title('强制消噪后的信号');
[thr,sorh,keepapp]=ddencmp('den','wv',s);
s2=wdencmp('gbl',c,l,'db1',3,thr,sorh,keepapp);
subplot(2,2,3);
plot(s2);grid;
title('默认阈值消噪后的信号');
softd1=wthresh(d1,'s',1.465);
softd2=wthresh(d2,'s',1.823);
softd3=wthresh(d3,'s',2.768);
c2=[a3 softd3 softd2 softd1];
s3=waverec(c2,l,'db1');
subplot(2,2,4);
plot(s3);grid;
title('给定软阈值消噪后的信号');
请高手帮帮忙了！

Answer 1

s=zeros(1,100);
s(50:100)=1;
subplot(2,2,1);plot(s); title('原始信号');
[c,l]=wavedec(s,3,'db1');
a3=appcoef(c,l,'db1',3);
d3=detcoef(c,l,3);
d2=detcoef(c,l,2);
d1=detcoef(c,l,1);
dd3=zeros(1,length(d3));
dd2=zeros(1,length(d2));
dd1=zeros(1,length(d1));
c1=[a3 dd3 dd2 dd1];
s1=waverec(c1,l,'db1');
subplot(2,2,2);
plot(s1);grid;
title('强制消噪后的信号');
[thr,sorh,keepapp]=ddencmp('den','wv',s);
s2=wdencmp('gbl',c,l,'db1',3,thr,sorh,keepapp);
subplot(2,2,3);
plot(s2);grid;
title('默认阈值消噪后的信号');
softd1=wthresh(d1,'s',1.465);
softd2=wthresh(d2,'s',1.823);
softd3=wthresh(d3,'s',2.768);
c2=[a3 softd3 softd2 softd1];
s3=waverec(c2,l,'db1');
subplot(2,2,4);
plot(s3);grid;
title('给定软阈值消噪后的信号');