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cophenetic matrix

Hello,
I analyse some free-sorting data so I use hierarchical
clustering.
I want to compare my proximity matrix with the tree 
representation to evalute the fitting. (stress, cophenetic correlation
(pearson's correlation)...)

"The cophenetic similarity of two objects a and b is defined as the
similarity level at wich objects a and b become members of the same
cluster during the course of clustering" Legendre, P and Legendre, L Numeri
Ecology, 1998.

I've made a (tricky) function to compute this cophenetic matrix. But now 
I need some help to evaluate my function with your data. Because for
little matrix (as Legendre's example), I found the same cophenetic
correlation  as Matlab do (direct calculation) but for bigger matrix
(30x30) my results differ!!

Maybe my function is wrong?
To use my function you need to have the sm library. 

Thanks 
Olivier Houix