util.h File Reference

Go to the source code of this file.

Classes
struct	Sparse
	Sparse Matrix structure. More...
Typedefs
typedef double(*	fx_t )(double x, void *data)
	Function-callback that is passed to gauss_kronrod15.
Functions
double	ipow (double x, int p)
	Power function.
int	gauss (double *A, double *b, double *x, int n)
	The Gauss method.
double	trapezoid_integral (int k, int n, double k1, double b1, double k2, double b2, double x1, double x3)
	Take the integral of over trapezoid.
double	trapezoid_integral_cos (int k, int n, double k1, double b1, double k2, double b2, double x1, double x3)
	Take the integral of over trapezoid.
double	trapezoid_integral_sin (int k, int n, double k1, double b1, double k2, double b2, double x1, double x3)
	Take the integral of over trapezoid.
double	trapezoid_integral_1_cos (int k, int n, double k1, double b1, double k2, double b2, double x1, double x3)
	Take the integral of over trapezoid.
void	mat_print (const double *A, int n)
	Print NxN matrix to stdout.
void	vec_print (const double *A, int n)
	Print vector to stdout.
void	mat_mult_vector (double *r, const double *A, const double *x, int n)
	Product of NxN matrix and vector.
void	sparse_mult_vector_l (double *r, const struct Sparse *A, const double *x, int n)
	If matrix is stored by columns then left multiply by vector: r = x A If matrix is stored by rows then right multiply by vector: r = A x.
void	sparse_mult_vector_r (double *r, const struct Sparse *A, const double *x, int n)
	If matrix is stored by columns then right multiply by vector: r = A x If matrix is stored by rows then left multiply by vector: r = x A.
void	sparse_print (const struct Sparse *A, int n, FILE *f)
	Print sparse matrix to file.
void	vec_sum1 (double *r, const double *a, const double *b, double k1, double k2, int n)
	Linear combination of two vectors.
void	vec_mult_scalar (double *a, const double *b, double k, int n)
	Product of vector by number.
void	vec_sum (double *r, const double *a, const double *b, int n)
	Sum of two vectors.
double	vec_norm2 (const double *v, int n)
	Vector norm.
double	vec_scalar2 (const double *a, const double *b, int n)
	Inner product of two vectors.
void	vec_mult (double *r, const double *a, const double *b, int n)
	Element by element vector multiplication.
void	vec_diff (double *r, const double *a, const double *b, int n)
	Difference of two vectors.
double	get_full_time ()
	Returns the number of seconds since epoch.
double	gauss_kronrod15 (double a, double b, fx_t fm, void *data)
	Gauss Kronrod quadrature formula.
void	set_fpe_except ()
	Sets FPU exceptions.

---

Detailed Description

Author:

Alexey Ozeritsky <aozeritsky@gmail.com>

Version:

Revision

cad6e724a001

DESCRIPTION

Misc functions.

Definition in file util.h.