JMATH::JPower Class Reference

Power law function object. More...

#include <JPower.hh>

Public Member Functions
	JPower (const double alpha, const double factor=1.0)
	Constructor. More...
double	getValue (const double x) const
	Function value. More...
double	getDerivative (const double x) const
	Derivative value. More...
double	getIntegral (const double x) const
	Integral value. More...
double	operator() (const double x) const
	Function value. More...

Protected Attributes
double	alpha
double	factor

Friends
std::istream &	operator>> (std::istream &in, JPower &object)
	Read power from input. More...
std::ostream &	operator<< (std::ostream &out, const JPower &object)
	Write power to output. More...

Detailed Description

Power law function object.

Evaluation of function, derivative and integral values.

Definition at line 22 of file JPower.hh.

Constructor & Destructor Documentation

JMATH::JPower::JPower ( const double  alpha, const double  factor = 1.0  )

inline

Constructor.

Parameters

alpha	spectral index
factor	multiplication factor

Definition at line 30 of file JPower.hh.

    {
      this->alpha  = alpha;
      this->factor = factor;
    }

Member Function Documentation

double JMATH::JPower::getValue ( const double  x ) const

inline

Function value.

Parameters

x	abscissa value

Returns

function value

Definition at line 44 of file JPower.hh.

    {
      return factor * pow(x, alpha);
    }

double JMATH::JPower::getDerivative ( const double  x ) const

inline

Derivative value.

Parameters

x	abscissa value

Returns

derivative value

Definition at line 56 of file JPower.hh.

    {
      return factor * alpha * pow(x, alpha - 1);
    }

double JMATH::JPower::getIntegral ( const double  x ) const

inline

Integral value.

Parameters

x	abscissa value

Returns

integral value

Definition at line 68 of file JPower.hh.

    {
      if (alpha != -1.0)
        return factor * pow(x, alpha + 1) / (alpha + 1);
      else
        return factor * log(x);
    }

double JMATH::JPower::operator() ( const double  x ) const

inline

Function value.

Parameters

x	abscissa value

Returns

function value

Definition at line 83 of file JPower.hh.

    {
      return getValue(x);
    }

Friends And Related Function Documentation

std::istream& operator>> ( std::istream &  in, JPower &  object  )

friend

Read power from input.

Parameters

in	input stream
object	power

Returns

input stream

Definition at line 96 of file JPower.hh.

    {
      in >> object.alpha >> object.factor;
      
      return in;
    }

std::ostream& operator<< ( std::ostream &  out, const JPower &  object  )

friend

Write power to output.

Parameters

out	output stream
object	trigonometric

Returns

output stream

Definition at line 111 of file JPower.hh.

    {
      return out << object.alpha << ' ' << object.factor;
    }

Member Data Documentation

double JMATH::JPower::alpha

protected

Definition at line 117 of file JPower.hh.

double JMATH::JPower::factor

protected

Definition at line 118 of file JPower.hh.

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

• JPower.hh