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LITlib - Excel Power Functions Pack
Add-in for Excel that adds additional cell functions to Excel.

litLIB Help - EigenValues function
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Vector and Matrix - EigenValues

= EigenValues(Matrix)

Calculates the eigenvalues of the matrix. The function returns a vector with eigenvalues.

The corresponding eigenvectors are calculated using the EigenVectors function. Eigenvalue i corresponds to the i-th column (the corresponding eigenvector) of the eigenvectors matrix.

The EigenValues is a matrix or array formula and you need to press CTRL+SHIFT+ENTER to apply it.

A restriction is that the input matrix needs to be a symmetrix matrix.

=EigenValues( mymatrix )