MATLAB DECOMPOSING

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Wavelet Packets: Decomposing the Details
In the orthogonal wavelet decomposition procedure, the generic step
splits the approximation coefficients into two parts. After splitting we
obtain a vector of approximation coefficients and a vector of detail
coefficients, both at a coarser scale. The information lost between two
successive approximations is captured in the detail coefficients. Then
the next step consists of splitting the new approximation coefficient
vector, successive details are never reanalyzed.
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I am tried to use wavelet packet and extract the signal ex :w3.0, …w3.7, i can find only how to plot wptree and get a tools to see every level signals but I cannot find the instruction used to get each signal of level and used it
Could you help me please in this problem
Best regard

falehabdallah