matrix2i_ptr.c File Reference

#include <vecmat.h>

Go to the source code of this file.

Functions
void	mat2i_identity_ptr (matrix2i *res)
	Initializes the integer 2x2 matrix to identity (diagonal 1, others 0).
void	mat2i_mul_ptr (matrix2i *res, const matrix2i *a, const matrix2i *b)
	Multiplies two integer 2x2 matrices (a * b) using explicit loops and stores the result in res.
void	mat2i_transpose_ptr (matrix2i *res, const matrix2i *m)
	Computes the transpose of the input integer 2x2 matrix and stores in res.
void	mat2i_inverse_ptr (matrix2i *res, const matrix2i *m)
	Computes the inverse of the input integer 2x2 matrix and stores in res.
void	mat2i_mul_vec2i_ptr (vector2i *res, const matrix2i *m, const vector2i *v)
	Multiplies a 2x2 integer matrix by a vector2i.

Function Documentation

mat2i_identity_ptr()

void mat2i_identity_ptr

(

matrix2i *

res

)

Initializes the integer 2x2 matrix to identity (diagonal 1, others 0).

Parameters

res	Pointer to the output matrix2i.

Definition at line 12 of file matrix2i_ptr.c.

References matrix2i::v.

Referenced by mat2i_identity(), and mat2i_inverse_ptr().

mat2i_inverse_ptr()

void mat2i_inverse_ptr	(	matrix2i *	res,
		const matrix2i *	m )

Computes the inverse of the input integer 2x2 matrix and stores in res.

Uses double precision for inversion, truncates to int; sets to identity if det=0.

Parameters

res	Pointer to the output matrix2i.
m	Pointer to the input matrix.

Definition at line 60 of file matrix2i_ptr.c.

References mat2i_determinant(), mat2i_identity_ptr(), and matrix2i::v.

Referenced by mat2i_inverse().

mat2i_mul_ptr()

void mat2i_mul_ptr	(	matrix2i *	res,
		const matrix2i *	a,
		const matrix2i *	b )

Multiplies two integer 2x2 matrices (a * b) using explicit loops and stores the result in res.

Parameters

res	Pointer to the output matrix2i.
a	Pointer to the first matrix.
b	Pointer to the second matrix.

Definition at line 27 of file matrix2i_ptr.c.

References matrix2i::m11, matrix2i::m12, matrix2i::m21, and matrix2i::m22.

Referenced by mat2i_mul().

mat2i_mul_vec2i_ptr()

void mat2i_mul_vec2i_ptr	(	vector2i *	res,
		const matrix2i *	m,
		const vector2i *	v )

Multiplies a 2x2 integer matrix by a vector2i.

Parameters

res	Output value.
m	Input matrix.
v	Input vector.

Definition at line 81 of file matrix2i_ptr.c.

References matrix2i::m11, matrix2i::m12, matrix2i::m21, matrix2i::m22, vector2i::x, and vector2i::y.

Referenced by mat2i_mul_vec2i().

mat2i_transpose_ptr()

void mat2i_transpose_ptr	(	matrix2i *	res,
		const matrix2i *	m )

Computes the transpose of the input integer 2x2 matrix and stores in res.

Parameters

res	Pointer to the output matrix2i.
m	Pointer to the input matrix.

Definition at line 44 of file matrix2i_ptr.c.

References matrix2i::v.

Referenced by mat2i_transpose().