eig3.h

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/* Eigen-decomposition for symmetric 3x3 real matrices.
   Public domain, copied from the public domain Java library JAMA. */

#ifndef _eig_h

/* Symmetric matrix A => eigenvectors in columns of V, corresponding
   eigenvalues in d. */
void eigen_decomposition(double A[3][3], double V[3][3], double d[3]);

#endif