ossim2dLinearRegression Class Reference

#include <ossim2dLinearRegression.h>

Public Member Functions
	ossim2dLinearRegression ()
void	getEquation (double &slope, double &intercept)
void	addPoint (const ossimDpt &pt)
void	clear ()
void	solve ()
ossim_uint32	getNumberOfPoints () const

Protected Attributes
ossim_uint32	theNumberOfPoints
double	theSumX
double	theSumY
double	theSumXX
double	theSumYY
double	theSumXY
double	theIntercept
double	theSlope
bool	theSolvedFlag

Friends
OSSIM_DLL std::ostream &	operator<< (std::ostream &out, const ossim2dLinearRegression &data)

Detailed Description

Definition at line 16 of file ossim2dLinearRegression.h.

Constructor & Destructor Documentation

ossim2dLinearRegression()

ossim2dLinearRegression::ossim2dLinearRegression

(

)

Definition at line 11 of file ossim2dLinearRegression.cpp.

References clear().

{
   clear();
}

Member Function Documentation

addPoint()

void ossim2dLinearRegression::addPoint ( const ossimDpt &  pt )

inline

Definition at line 33 of file ossim2dLinearRegression.h.

References ossimDpt::x, and ossimDpt::y.

Referenced by ossimLocalCorrelationFusion::computeRegression().

      {
//         thePoints.push_back(pt);
         ++theNumberOfPoints;
         theSumX  += pt.x;
         theSumY  += pt.y;
         theSumXX += pt.x*pt.x;
         theSumYY += pt.y*pt.y;
         theSumXY += pt.x*pt.y; 
         theSolvedFlag     = false;
      }

clear()

void ossim2dLinearRegression::clear ( )

inline

Definition at line 44 of file ossim2dLinearRegression.h.

Referenced by ossim2dLinearRegression().

      {
//         thePoints.clear();
         theNumberOfPoints = 0;
         theSumX           = 0.0;
         theSumXX          = 0.0;
         theSumY           = 0.0;
         theSumYY          = 0.0;
         theIntercept      = 0.0;
         theSlope          = 0.0;
         theSumXY          = 0.0;
         theSolvedFlag     = false;
      }

getEquation()

void ossim2dLinearRegression::getEquation ( double &  slope, double &  intercept  )

inline

Definition at line 27 of file ossim2dLinearRegression.h.

Referenced by ossimLocalCorrelationFusion::computeRegression().

   {
      slope     = theSlope;
      intercept = theIntercept;
   }

getNumberOfPoints()

ossim_uint32 ossim2dLinearRegression::getNumberOfPoints ( ) const

inline

Definition at line 58 of file ossim2dLinearRegression.h.

      {
         return theNumberOfPoints;
//         return thePoints.size();
      }

solve()

void ossim2dLinearRegression::solve

(

)

Definition at line 16 of file ossim2dLinearRegression.cpp.

References FLT_EPSILON, theIntercept, theNumberOfPoints, theSlope, theSolvedFlag, theSumX, theSumXX, theSumXY, and theSumY.

Referenced by ossimLocalCorrelationFusion::computeRegression().

{
   
//    theSumX           = 0.0;
//    theSumXX          = 0.0;
//    theSumY           = 0.0;
//    theSumYY          = 0.0;
//    theIntercept      = 0.0;
//    theSlope          = 0.0;
//    theSumXY          = 0.0;
//    ossim_uint32 idx = 0;
//    for(idx = 0; idx < thePoints.size(); ++idx)
//    {
//       theSumX  += thePoints[idx].x;
//       theSumY  += thePoints[idx].y;
//       theSumXX += thePoints[idx].x*thePoints[idx].x;
//       theSumYY += thePoints[idx].y*thePoints[idx].y;
//       theSumXY += thePoints[idx].x*thePoints[idx].y; 
      
//    }
   
   double numberOfPoints = (double)theNumberOfPoints;

   if(numberOfPoints < 1)
   {
      theSlope = 0.0;
      theIntercept = 0.0;
      return;
   }
   double Sxx = theSumXX - ((theSumX*theSumX)/numberOfPoints);
   double Sxy = theSumXY - ((theSumX*theSumY)/numberOfPoints);

   if(fabs(Sxx) < FLT_EPSILON)
   {
      theSlope = 0.0;
      theIntercept = 0.0;
      return;
   }
   
   theSlope     = Sxy/Sxx;
   theIntercept = (theSumY - theSlope*theSumX)/numberOfPoints;

   theSolvedFlag = true;
}

Friends And Related Function Documentation

operator<<

OSSIM_DLL std::ostream& operator<< ( std::ostream &  out, const ossim2dLinearRegression &  data  )

friend

Definition at line 19 of file ossim2dLinearRegression.h.

      {
         out << "y = " << data.theSlope << "*x + " << data.theIntercept;

         return out;
      }

Member Data Documentation

theIntercept

double ossim2dLinearRegression::theIntercept

protected

Definition at line 72 of file ossim2dLinearRegression.h.

Referenced by solve().

theNumberOfPoints

ossim_uint32 ossim2dLinearRegression::theNumberOfPoints

protected

Definition at line 65 of file ossim2dLinearRegression.h.

Referenced by solve().

theSlope

double ossim2dLinearRegression::theSlope

protected

Definition at line 73 of file ossim2dLinearRegression.h.

Referenced by solve().

theSolvedFlag

bool ossim2dLinearRegression::theSolvedFlag

protected

Definition at line 74 of file ossim2dLinearRegression.h.

Referenced by solve().

theSumX

double ossim2dLinearRegression::theSumX

protected

Definition at line 66 of file ossim2dLinearRegression.h.

Referenced by solve().

theSumXX

double ossim2dLinearRegression::theSumXX

protected

Definition at line 68 of file ossim2dLinearRegression.h.

Referenced by solve().

theSumXY

double ossim2dLinearRegression::theSumXY

protected

Definition at line 70 of file ossim2dLinearRegression.h.

Referenced by solve().

theSumY

double ossim2dLinearRegression::theSumY

protected

Definition at line 67 of file ossim2dLinearRegression.h.

Referenced by solve().

theSumYY

double ossim2dLinearRegression::theSumYY

protected

Definition at line 69 of file ossim2dLinearRegression.h.

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

• ossim2dLinearRegression.h
• ossim2dLinearRegression.cpp