What is the difference between wrcoef/upcoef/appcoef in wavelet analysis?

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Sijie Huang 2019-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/487969-what-is-the-difference-between-wrcoef-upcoef-appcoef-in-wavelet-analysis

回答： Dinesh Yadav 2019-11-1

Hi,

Currently I am doing wavelet analysis on a signal. My purpose is to reconstruct the signal on a certain level. However, I found couple of functions, i.e., wrcoef/upcoef/appcoef can seemingly do the trick. So I am confused what's their difference, and which one I should use?

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Answer 1

Dinesh Yadav 2019-11-1

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Hi,

If your purpose is solely reconstructing the signal on a certain level use any of the two wrcoef/appcoef. If you want some other specific behaviour please go through the documentation links below and see what suits your needs.

https://www.mathworks.com/help/wavelet/ref/wrcoef.html

https://www.mathworks.com/help/wavelet/ref/upcoef.html

https://www.mathworks.com/help/wavelet/ref/appcoef.html

https://www.mathworks.com/help/wavelet/ref/wavedec.html

Hope it helps.