Save data from for-loop and their use

Question

stelios loizidis 2020-8-10

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https://ww2.mathworks.cn/matlabcentral/answers/577651-save-data-from-for-loop-and-their-use

评论： stelios loizidis 2020-8-10

Hello,

I have the following problems. I have matrices: SatTrDatax_Norm (4X200) and SatTrDatay_Norm (4x50). I want to apply wavelet decomposition(wavedec) to each line separately. Next, I try to save the results to new matrices (C1,L1,C2,L2). Use for-loop but save the last value in C1,L1,C2,L2.How do I store all values resulting from the for-loop? The second problem concerns reconstruction (wrcoeff). The matrices C1,L1,C2,L2 according to the documentation must be a vector. How is this going to be done? Your help is invaluable.

for i=1:4
[C1,L1]=wavedec(SatTrDatax_Norm(i,:),3,'db1');
[C2,L2]=wavedec(SatTrDatay(i,:),3,'db1');
end
AppTrDxNorm_Sat=wrcoef('a',C1,L1,'db5',3);
D1TrDxNorm_Sat=wrcoef('d',C1,L1,'db5',1);
D2TrDxNorm_Sat=wrcoef('d',C1,L1,'db5',2);
D3TrDxNorm_Sat=wrcoef('d',C1,L1,'db5',3);
%
AppTrDySat=wrcoef('a',C2,L2,'db5',3);
D1TrDySat=wrcoef('d',C2,L2,'db5',1);
D2TrDySat=wrcoef('d',C2,L2,'db5',2);
D3TrDySat=wrcoef('d',C2,L2,'db5',3);

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Answer 1

Shae Morgan 2020-8-10

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https://ww2.mathworks.cn/matlabcentral/answers/577651-save-data-from-for-loop-and-their-use#answer_477565

编辑：Shae Morgan 2020-8-10

在 MATLAB Online 中打开

You just need to index your output and then reference the appropraite index

for i=1:4
[C1(i,:),L1(i,:)]=wavedec(SatTrDatax_Norm(i,:),3,'db1');
[C2(i,:),L2(i,:)]=wavedec(SatTrDatay(i,:),3,'db1');
end

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Shae Morgan 2020-8-10

编辑：Shae Morgan 2020-8-10

在 MATLAB Online 中打开

I'm not sure what the problem is: Below works just fine for me in version 2020a

I noticed in your for-loop you call SatTrDatay rather than SatTrDatay_Norm (like you state in your question). That might be part of the problem

SatTrDatax_Norm=rand(4,200);
SatTrDatay_Norm=rand(4,50);
for i=1:4
[C1(i,:),L1(i,:)]=wavedec(SatTrDatax_Norm(i,:),3,'db1');
[C2(i,:),L2(i,:)]=wavedec(SatTrDatay_Norm(i,:),3,'db1'); %Make sure you use the right variable here
end
AppTrDxNorm_Sat=wrcoef('a',C1(1,:),L1(1,:),'db5',3);