src/utils.c File Reference

Set of different function for linear systems. More...

#include "utils.h"

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Functions
double	euclidian_norm (size_t n, double *const x)
	Derive the euclidian norm of a vector, that is, .
double	inner_product (size_t n, double *const x)
	Derive the ordinary inner product of a vector, that is, .
void	copy_vector (size_t n, double *const x, double *const y)
	Copy the vector x in y.
void	copy_matrix (size_t m, size_t n, double **const A, double **const B)
	Copy the matrix A in B.
void	print_matrix (size_t m, size_t n, double **const A, char *const name)
	Display in stdout a matrix m-by-n.
void	print_vector (size_t idx, size_t n, double *const v, char *const name)
	Display in stdout a n-dimensional vector starting by an index.
double *	malloc_vector (size_t n)
	Malloc a n-dimensional vector.
void	free_vector (double *p)
	Free a vector.
double **	malloc_matrix (size_t m, size_t n)
	Malloc a m-by-n matrix.
void	free_matrix (size_t m, double **p)
	Free a matrix with m rows.
void	allocated_vector (void *p, size_t n)
void	free_vector2 (void *p, size_t n)
void	allocated_matrix (void **p, size_t m, size_t n)
void	free_matrix2 (void **p, size_t m, size_t n)

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Detailed Description

Set of different function for linear systems.

Author:

Joan

Date:

04/12/2013 (start)

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Function Documentation

void allocated_matrix	(	void **	p,
		size_t	m,
		size_t	n
	)

References free_vector2().

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void allocated_vector	(	void *	p,
		size_t	n
	)

void copy_matrix	(	size_t	m,
		size_t	n,
		double **const	A,
		double **const	B
	)

Copy the matrix A in B.

Parameters:

[in]	m	Rows
[in]	m	Columns
[in]	A	Source matrix
[out]	B	Destination matrix

Precondition:

The pointers are not NULL

Warning:

The pointers should not be the same

References pic::n.

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void copy_vector	(	size_t	n,
		double *const	x,
		double *const	y
	)

Copy the vector x in y.

Parameters:

[in]	n	Dimension
[in]	x	Source vector
[out]	y	Destination vector

Precondition:

The pointers are not NULL

Warning:

The pointers should not be the same

References pic::n.

double euclidian_norm	(	size_t	n,
		double *const	x
	)

Derive the euclidian norm of a vector, that is, .

Parameters:

[in]	n	Dimension of vector
[in]	x	Input vector

Returns:

Euclidian norm

Postcondition:

Thre result is greater than or equal to zero

Note:

If the pointer is NULL, the result is zero

References pic::n.

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void free_matrix	(	size_t	m,
		double **	p
	)

Free a matrix with m rows.

Parameters:

[in]

m

Rows

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void free_matrix2	(	void **	p,
		size_t	m,
		size_t	n
	)

References free_vector2().

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void free_vector

(

double *

p

)

Free a vector.

Parameters:

[in]

p

Pointer

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void free_vector2	(	void *	p,
		size_t	n
	)

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double inner_product	(	size_t	n,
		double *const	x
	)

Derive the ordinary inner product of a vector, that is, .

Parameters:

[in]	n	Dimension of vector
[in]	x	Input vector

Returns:

Inner product

Postcondition:

The result is greater than or equal to zero

Note:

If the pointer is NULL, the result is zero

References pic::n.

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double** malloc_matrix	(	size_t	m,
		size_t	n
	)

Malloc a m-by-n matrix.

Parameters:

[in]	m	Rows
[in]	n	Columns

Returns:

Pointer to a matrix

Note:

The return value could be NULL

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double* malloc_vector

(

size_t

n

)

Malloc a n-dimensional vector.

Parameters:

[in]

n

End index

Returns:

Pointer to a malloc vector

Note:

The return value could be NULL

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void print_matrix	(	size_t	m,
		size_t	n,
		double **const	A,
		char *const	name
	)

Display in stdout a matrix m-by-n.

Parameters:

[in]	m	Rows
[in]	n	Columns
[in]	A	Matrix m-by-n
[in]	name	Name of the matrix in stdout

Precondition:

The dimension are not zeros and the pointers are not NULL

References pic::n.

void print_vector	(	size_t	idx,
		size_t	n,
		double *const	v,
		char *const	name
	)

Display in stdout a n-dimensional vector starting by an index.

Parameters:

[in]	idx	Start index
[in]	n	End index
[in]	v	Vector
[in]	name	Name of the vector in stdout

Precondition:

The idx is less than n and the pointers are not NULL

References pic::n.

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