How to do wavelet decomposition and hierarchical clustering in Matlab?

Hello

I want to apply a wavelet decomposition on a vector x using Matlab wpdec function. How can I retrieve from this the approximation and detail coefficients at different decomposition levels?

Seecond, I want to apply Ward clustering on the rows of a matrix X (with Euclidean distance). In Matlab I can do it with

    Z = linkage(A,'ward','euclidean');

In the end I want 8 clusters. For deriving the clusters I want to use the inconsistency coefficient as described here :

In Matlab it can be done like that:

    T = cluster(Z,'cutoff',1.2);

The problem now is that I want exactly 8 clusters, so I don't know the value of the "cutoff"

How can I do this to retrieve exactly 8 clusters? Perhaps the Matlab function inconsistent must be used?