load（‘BPdata.mat‘）;
KNdata=cell（1300）;
for?i=1:300
????for?j=1:3
leleccum=data{i}（j:）;
s=leleccum（1:1000）;
l_s=length（s）;
[cA1cD1]=dwt（s‘db1‘）;
A1=upcoef（‘a(chǎn)‘cA1‘db1‘1l_s）;
D1=upcoef（‘d‘cD1‘db1‘1l_s）;
%
A0=idwt（cA1cD1‘db1‘l_s）;
err=max（abs（s-A0））;
%
[CL]?=?wavedec（s3‘db1‘）;
cA3?=?appcoef（CL‘db1‘3）;
cD3?=?detcoef（CL3）;
cD2?=?detcoef（CL2）;
cD1?=?detcoef（CL1）;
A3?=?wrcoef（‘a(chǎn)‘CL‘db1‘3）;
D1?=?wrcoef（‘d‘CL‘db1‘1）;
D2?=?wrcoef（‘d‘CL‘db1‘2）;
D3?=?wrcoef（‘d‘CL‘db1‘3）;
%
A0?=?waverec（CL‘db1‘）;
err?=?max（abs（s-A0））;
A33（j:）=A3;

????end
KNdata（1i）={A33};
end


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