Differences in Wavelet results between code and 'wavemenu' GUI/App

Question

Robert 2015-5-19

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https://ww2.mathworks.cn/matlabcentral/answers/217503-differences-in-wavelet-results-between-code-and-wavemenu-gui-app

评论： Robert 2015-5-22

采纳的回答： Nalini Vishnoi

Plots.jpg

I have the following small piece of code

[C,L] = wavedec(data,6,'dmey')

It spits out a meyer wavelet decomposition. However, the results differ greatly from when I use the wavelet GUI/App (wavemenu) (see attached plots of D6 using both methods).

The results from the GUI are more reasonable and what I am trying to replicate with the code, I can't understand why the results are so different, am I missing something in the code?

I need to use code, not just the GUI and I need to perform literally hundreds of these decomposition, you can't do that in the GUI.

Thank you in advance for any help! I am a newbie so detail would be appreciated

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Answer 1

Nalini Vishnoi 2015-5-20

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Hi Robert,

Can you please post your data? I tried to reproduce the same with MATLAB (demo) data using the following code and GUI at the same time:

load sumsin; s = sumsin;
[c,l] = wavedec(s,6,'dmey');
cA3 = appcoef(c,l,'dmey',6);
[cD1,cD2,cD3,cD4,cD5,cD6] = detcoef(c,l,[1,2,3,4,5,6]);
D6 = wrcoef('d',c,l,'dmey',6); % Just reconstructing the details at level 6
figure, plot(D6);

When I compared plot of 'D6' computed using the code and from the GUI, I got identical results. In order to help you, I would need to take a look at the data you are using.

Thanks,

Nalini