www.pudn.com > AdaBoost_weaklearner_1.rar > vector.cpp

#include "vector.h" 
#include  
#include  
#include  
 
// set x, y and z values of the current vector // 
void Vector::set(double _x, double _y, double _z) 
{ 
	x=_x; 
	y=_y; 
	z=_z; 
} 
 
// normalize the current vector to unit length // 
void Vector::normalize(void) 
{ 
	double d=sqrt(x*x+y*y+z*z); 
	if(d == 0) 
	{ 
		cout << "zero length vector\n"; 
		exit(1); 
	} 
	x /= d; 
	y /= d; 
	z /= d; 
} 
 
// scale the current vector with a constant // 
Vector& Vector::scale(double coeff) 
{ 
	x *= coeff; 
	y *= coeff; 
	z *= coeff; 
 
	return  *this; 
} 
 
// calculate the dot product of the current vector with vector v // 
double Vector::dotProd(const Vector& v) 
{ 
	return x*v.x+y*v.y+z*v.z; 
} 
 
// calculate the cross product of the current vector with 
// vector v, the resulting vector is stored in "res" // 
void Vector :: crossProd(Vector& res, const Vector& v) 
{ 
	double i=y*v.z-z*v.y; 
	double j=z*v.x-x*v.z; 
	double k=x*v.y-y*v.x; 
	res.set(i, j, k); 
} 
 
// add the current vetor to vector v // 
Vector Vector::operator+ (const Vector& v) 
{ 
	Vector vec; 
	double i=x+v.x; 
	double j=y+v.y; 
	double k=z+v.z; 
	vec.set(i, j, k); 
 
	return vec; 
} 
 
// subtract vector v from the current vector // 
Vector Vector::operator- (const Vector& v) 
{ 
	Vector vec; 
	double i=x-v.x; 
	double j=y-v.y; 
	double k=z-v.z; 
	vec.set(i, j, k); 
 
	return vec; 
} 
 
Vector& Vector::operator= (const Vector& v) 
{ 
	if(this==&v) 
		return *this; 
    x=v.x; 
	y=v.y; 
	z=v.z; 
 
	return *this; 
}