regd Minimum Description Length of Eigenvalues of Square symmetric matrix

Hi all,

Iam working on matrix dimensionality reduction in information retrieval
problems. One method to identify the number of dimensions to be
retained in a term by document matrix (A of size mxn) is to identify
the Minimum Description Length (MDL) of Eigenvalues of Square symmetric
matrix (A' * A of size n x n). This was described by Hongyuan Zha.

But to identify the MDL we have to perform the arithmetic and geometric
mean of the Eigenvalus of A' * A.

The problem Iam facing is: in calculating the geometric mean of
Eigenvalues, the product of all the Eigenvalues is becoming "infinity".

Can any body tell some wayout. Iam using MATLAB environment.

Please help me

wishes

Ch. AswaniKumar

.