src/cvecmat.c File Reference

C library for vector and matrix manipulations. More...

#include <math.h>
#include "cvecmat.h"

Functions
void	ccp4_dcross (const double a[3], const double b[3], double c[3])
void	ccp4_3matmul (double c[3][3], const double a[3][3], const double b[3][3])
void	ccp4_4matmul (float c[4][4], const float a[4][4], const float b[4][4])
double	invert3matrix (const double a[3][3], double ai[3][3])
float	invert4matrix (const float a[4][4], float ai[4][4])
float	ccp4_pow_ii (const float base, const int power)

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Detailed Description

C library for vector and matrix manipulations.

Author:

Martyn Winn

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Function Documentation

void ccp4_3matmul	(	double	c[3][3],
		const double	a[3][3],
		const double	b[3][3]
	)

3x3 matrix product This function computes the matrix product between two 3x3 matrices.

Parameters:

[out]	c	matrix product
[in]	a	left matrix
[in]	b	right matrix

Referenced by ccp4uc_fracu_to_orthu(), and ccp4uc_orthu_to_fracu().

void ccp4_4matmul	(	float	c[4][4],
		const float	a[4][4],
		const float	b[4][4]
	)

4x4 matrix product. This function computes the matrix product between two 4x4 matrices.

Parameters:

[out]	c	matrix product
[in]	a	left matrix
[in]	b	right matrix

Referenced by ccp4spg_load_spacegroup().

void ccp4_dcross	(	const double	a[3],
		const double	b[3],
		double	c[3]
	)

Vector cross product This function computes the vector cross product c = a X b

Parameters:

[in]	a	vector 1
[in]	b	vector 2
[out]	c	cross product vector

Referenced by invert3matrix().

float ccp4_pow_ii	(	const float	base,
		const int	power
	)

Compute powers. This function computes powers of any base to any integer power.

Parameters:

[in]	base
[in]	power

Returns:

result of power calculation

Referenced by invert4matrix().

double invert3matrix	(	const double	a[3][3],
		double	ai[3][3]
	)

3x3 matrix inversion.

Parameters:

[in]	a	3*3 matrix to be inverted
[out]	ai	inverse matrix

Returns:

Determinant

References ccp4_dcross().

Referenced by ccp4uc_frac_orth_mat().

float invert4matrix	(	const float	a[4][4],
		float	ai[4][4]
	)

4x4 matrix inversion.

Parameters:

[in]	a	4x4 matrix to be inverted
[out]	ai	inverse matrix

Returns:

Determinant

References ccp4_pow_ii().

Referenced by ccp4_symop_invert(), and ccp4spg_load_spacegroup().