Vec.hh File Reference

#include <cmath>
#include <iostream>
#include <sstream>
#include "Rtypes.h"

Go to the source code of this file.

Classes
struct	Vec
	The Vec class is a straightforward 3-d vector, which also works in pyroot. More...

Functions
std::ostream &	operator<< (std::ostream &out, const Vec &v)
	Write vector to output stream.
std::istream &	operator>> (std::istream &in, Vec &v)
	Read vector from input stream.
double	cos_angle_between (const Vec &a, const Vec &b)
	Get cosine of space angle between two vectors.
double	angle_between (const Vec &a, const Vec &b)
	Get space angle between two vectors.
Vec	operator+ (const Vec &a, const Vec &b)
	Add two vectors.
Vec	operator- (const Vec &a, const Vec &b)
	Subtract two vectors.
Vec	operator* (double a, const Vec &v)
	Multiply vector.
Vec	operator* (const Vec &v, double a)
	Multiply vector.
Vec	operator/ (const Vec &v, double a)
	Divide vector.

Function Documentation

operator<<()

std::ostream & operator<< ( std::ostream & out, const Vec & v )

inline

Write vector to output stream.

Parameters

out	output stream
v	vector

Returns

output stream

Definition at line 284 of file Vec.hh.

{
  out << v.x << " " << v.y << " " << v.z << " ";
  return out;
}

operator>>()

std::istream & operator>> ( std::istream & in, Vec & v )

inline

Read vector from input stream.

Parameters

in	input stream
v	vector

Returns

input stream

Definition at line 297 of file Vec.hh.

{ 
  in >> v.x >> v.y >> v.z ; return in;
}

cos_angle_between()

double cos_angle_between ( const Vec & a, const Vec & b )

inline

Get cosine of space angle between two vectors.

Parameters

a	first vector
b	second vector

Returns

cosine

Definition at line 309 of file Vec.hh.

{
  const double n = a.len() * b.len();
  return a.dot(b) / n;
}

angle_between()

double angle_between ( const Vec & a, const Vec & b )

inline

Get space angle between two vectors.

Parameters

a	first vector
b	second vector

Returns

angle [rad]

Definition at line 322 of file Vec.hh.

{
  double c = cos_angle_between( a, b );
  if ( c < -1 ) return M_PI;
  if ( c > 1  ) return 0;
  return acos( c );
}

operator+()

Vec operator+ ( const Vec & a, const Vec & b )

inline

Add two vectors.

Parameters

a	first vector
b	second vector

Returns

vector

Definition at line 337 of file Vec.hh.

{ Vec r(a); return r+=b;}

operator-()

Vec operator- ( const Vec & a, const Vec & b )

inline

Subtract two vectors.

Parameters

a	first vector
b	second vector

Returns

vector

Definition at line 346 of file Vec.hh.

{ Vec r(a); return r-=b;}

operator*() [1/2]

Vec operator* ( double a, const Vec & v )

inline

Multiply vector.

Parameters

a	factor
v	vector

Returns

vector

Definition at line 355 of file Vec.hh.

{ return Vec(a*v.x,a*v.y,a*v.z);}

operator*() [2/2]

Vec operator* ( const Vec & v, double a )

inline

Multiply vector.

Parameters

v	vector
a	factor

Returns

vector

Definition at line 364 of file Vec.hh.

{ return Vec(a*v.x,a*v.y,a*v.z);}

operator/()

Vec operator/ ( const Vec & v, double a )

inline

Divide vector.

Parameters

v	vector
a	factor

Returns

vector

Definition at line 373 of file Vec.hh.

{ return Vec(v.x/a,v.y/a,v.z/a);}