00001 #ifndef EIG_H__ 00002 #define EIG_H__ 00003 00004 #include <matrices.h> 00005 #include <valarray> 00006 00007 namespace eo { 00008 /* ========================================================= */ 00009 /* 00010 Calculating eigenvalues and vectors. 00011 Input: 00012 N: dimension. 00013 C: lower_triangular NxN-matrix. 00014 niter: number of maximal iterations for QL-Algorithm. 00015 Output: 00016 diag: N eigenvalues. 00017 Q: Columns are normalized eigenvectors. 00018 return: number of iterations in QL-Algorithm. 00019 */ 00020 extern int eig( int N, const lower_triangular_matrix& C, std::valarray<double>& diag, square_matrix& Q, 00021 int niter = 0); 00022 00023 } // namespace eo 00024 00025 #endif
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