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[eigvec,eigval_matrix]=eigs(tSb,tSw,r,'la',opts);
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Error using eigs/checkInputs (line 919)
Eigenvalue range sigma must be a valid 2-element string.
For real symmetric A, the choices are 'LM', 'SM', 'LA', 'SA' or
'BE'.
For non-symmetric or complex A, the choices are 'LM', 'SM', 'LR',
'SR', 'LI' or 'SI'.

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