PhysicsTools::Spline::Segment Struct Reference

internal class describing a "segment" (between two x points) More...

Public Member Functions
double	deriv (double x) const
double	eval (double x) const
double	integral (double x) const

Public Attributes
double	area
double	coeffs [4]

Detailed Description

internal class describing a "segment" (between two x points)

Definition at line 56 of file Spline.h.

Member Function Documentation

double PhysicsTools::Spline::Segment::deriv

(

double

x

)

const

Definition at line 32 of file Spline.cc.

References tmp, and x.

Referenced by PhysicsTools::Spline::deriv().

{
    double tmp;
    double d = 0.0;
    d += coeffs[1];         tmp = x;
    d += coeffs[2] * tmp * 2.0; tmp *= x;
    d += coeffs[3] * tmp * 3.0;
    return d;
}

double PhysicsTools::Spline::Segment::eval

(

double

x

)

const

Definition at line 21 of file Spline.cc.

References coeffs, tmp, x, and detailsBasic3DVector::y.

Referenced by PhysicsTools::Spline::eval().

{
    double tmp;
    double y = 0.0;
    y += coeffs[0];     tmp = x;
    y += coeffs[1] * tmp;   tmp *= x;
    y += coeffs[2] * tmp;   tmp *= x;
    y += coeffs[3] * tmp;
    return y;
}

double PhysicsTools::Spline::Segment::integral

(

double

x

)

const

Definition at line 42 of file Spline.cc.

References PhysicsTools::Spline::area, tmp, and x.

Referenced by PhysicsTools::Spline::set().

{
    double tmp = x;
    double area = this->area;
    area += coeffs[0] * tmp;           tmp *= x;
    area += coeffs[1] * tmp * (1.0 / 2.0); tmp *= x;
    area += coeffs[2] * tmp * (1.0 / 3.0); tmp *= x;
    area += coeffs[3] * tmp * (1.0 / 4.0);
    return area;
}

Member Data Documentation

double PhysicsTools::Spline::Segment::area

Definition at line 58 of file Spline.h.

Referenced by PhysicsTools::Spline::set().

double PhysicsTools::Spline::Segment::coeffs[4]

Definition at line 57 of file Spline.h.

Referenced by eval(), and PhysicsTools::Spline::set().