作业帮请教高手matlab小波消噪问题.>> load flow;index=1:307;>> s=flow(index);>> subplot(2,2,1);>> subplot(2,2,1);plot(s);ylabel('幅值 A');>> [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);>>
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/21 01:26:17
![请教高手matlab小波消噪问题.>> load flow;index=1:307;>> s=flow(index);>> subplot(2,2,1);>> subplot(2,2,1);plot(s);ylabel('幅值 A');>> [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);>>](/uploads/image/z/5442593-41-3.jpg?t=%E8%AF%B7%E6%95%99%E9%AB%98%E6%89%8Bmatlab%E5%B0%8F%E6%B3%A2%E6%B6%88%E5%99%AA%E9%97%AE%E9%A2%98.%3E%3E+load+flow%3Bindex%3D1%3A307%3B%3E%3E+s%3Dflow%28index%29%3B%3E%3E+subplot%282%2C2%2C1%29%3B%3E%3E+subplot%282%2C2%2C1%29%3Bplot%28s%29%3Bylabel%28%27%E5%B9%85%E5%80%BC+A%27%29%3B%3E%3E+%5Bc%2Cl%5D%3Dwavedec%28s%2C3%2C%27db1%27%29%3Ba3%3Dappcoef%28c%2Cl%2C%27db1%27%2C3%29%3Bd3%3Ddetcoef%28c%2Cl%2C3%29%3Bd2%3Ddetcoef%28c%2Cl%2C2%29%3Bd1%3Ddetcoef%28c%2Cl%2C1%29%3B%3E%3E)
请教高手matlab小波消噪问题.>> load flow;index=1:307;>> s=flow(index);>> subplot(2,2,1);>> subplot(2,2,1);plot(s);ylabel('幅值 A');>> [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);>>
请教高手matlab小波消噪问题.
>> load flow;
index=1:307;
>> s=flow(index);
>> subplot(2,2,1);
>> subplot(2,2,1);
plot(s);
ylabel('幅值 A');
>> [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,'LineWidth',1);
>> xlabel('样本序号 n');
>> ylabel('幅值 A')
>> 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,'LineWidth',1);
>> xlabel('样本序号 n');
>> ylabel('幅值 A')
>> title('默认阈值消噪后的信号');
>> softd1=wthresh(d1,'s',1.565);
>> softd2=wthresh(d2,'s',1.825);
>> softd3=wthresh(d3,'s',2.765);
>> c2=[a3,softd3,softd2,softd1];
走到这里显示?Error using ==> horzcat
All matrices on a row in the bracketed expression must have the
same number of rows.请问怎么改?
请教高手matlab小波消噪问题.>> load flow;index=1:307;>> s=flow(index);>> subplot(2,2,1);>> subplot(2,2,1);plot(s);ylabel('幅值 A');>> [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);>>
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