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#ifndef _CONJUGATE_GRADIENT_H
#define _CONJUGATE_GRADIENT_H
#include <valarray>
double
inner(std::valarray<double> const &x,
std::valarray<double> const &y);
void
conjugate_gradient(double **A,
double *x,
double *b,
unsigned n,
double tol,
unsigned max_iterations);
void
conjugate_gradient(std::valarray<double> const &A,
std::valarray<double> &x,
std::valarray<double> const &b,
unsigned n, double tol,
unsigned max_iterations);
#endif // _CONJUGATE_GRADIENT_H
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