10 lines
417 B
C
10 lines
417 B
C
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//Davidson diagonalization of real symmetric matrix
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//matrix can be any class which provides nrows(), diagonalof() and operator*(const NRVec<T>) methods
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//does not even have to be explicitly stored - direct CI
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//n<0 highest eigenvalues, n>0 lowest eigenvalues
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template <class T, class matrix>
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extern void davidson(const matrix &a, NRVec<T> *vecs /*input-output*/, T *vals, const int n=1, const double eps=1e-10);
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