Tensor analysis.m

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Returns diagnostic information about an interaction tensor. Syntax:

       [eigvals,dcm,iso]=tensor_analysis(spin_system,tensor)

Parameters:

          tensor - a 3x3 Cartesian interaction tensor matrix 

Outputs:

         eigvals - eigenvalues of the tensor
             dcm - directional cosine matrix for the orientation
                   of the tensor eigenframe relative to the fra-
                   me it's been supplied in.
             iso - isotropic part of the tensor

Note: directional cosine matrix is not unique. Although the function makes some effort at consistency, it cannot be guaranteed.