OBSqrtTbl Class Reference

Square Root lookup table - given a distance squared returns distance. More...

#include <openbabel/obutil.h>

List of all members.

Public Member Functions

 OBSqrtTbl ()
 OBSqrtTbl (const double max, const double incr)
 ~OBSqrtTbl ()
double Sqrt (double d2) const
void Init (double max, double incr)

Detailed Description

Square Root lookup table - given a distance squared returns distance.

Constructor & Destructor Documentation

OBSqrtTbl (  )  [inline]

OBSqrtTbl ( const double  max,
const double  incr 
) [inline]

Create a square root table to handle up to the square root of max (e.g., if you want the square root of 144, supply 12 for max).

Parameters:
max The maximum square root stored in the lookup table
incr The floating point resolution of the lookup table

~OBSqrtTbl (  )  [inline]

Member Function Documentation

double Sqrt ( double  d2  )  const [inline]

Fast square root calculation using a lookup table.

Returns:
Square root of d2

void Init ( double  max,
double  incr 
) [inline]

Initialize the square root lookup table.

Parameters:
max The maximum square root stored in the lookup table (e.g., if you want the square root of 144, supply 12 for max)
incr The floating point resolution of the lookup table

The documentation for this class was generated from the following file: