Package ffx.numerics.integrate

Class PolynomialCurve

java.lang.Object

ffx.numerics.integrate.FunctionDataCurve

ffx.numerics.integrate.PolynomialCurve

All Implemented Interfaces:

DataSet

public class PolynomialCurve
extends FunctionDataCurve

A PolynomialCurve describes points along a polynomial function.

Author:

Jacob M. Litman

Field Summary

Fields inherited from class ffx.numerics.integrate.FunctionDataCurve

halfWidthEnd, lb, points, ub, x

Constructor Summary

Constructors

Constructor	Description
PolynomialCurve(double[] x, boolean halfWidthEnds, double[] coefficients)	Default constructor, assumes constant-width bins.
PolynomialCurve(double[] x, double[] coefficients)	Default constructor, assumes constant-width bins.

Method Summary

Modifier and Type	Method	Description
double	fX(double x)	Evaluates the function at x.
double	integralAt(double x)	Analytical integral at a point.
String	toString()

Methods inherited from class ffx.numerics.integrate.FunctionDataCurve

analyticalIntegral, analyticalIntegral, approxEquals, approxEquals, assertXIntegrity, binWidth, getAllFxPoints, getFxPoint, getX, halfWidthEnds, lowerBound, numPoints, upperBound

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

PolynomialCurve

public PolynomialCurve(double[] x,
 double[] coefficients)

Default constructor, assumes constant-width bins. Functional form will be a0 + a1x + a2x^2 + a3x^3 + ... + anx^n.

Parameters:

x - an array of

invalid reference

double

objects.

coefficients - Lowest-order coefficients first

PolynomialCurve

public PolynomialCurve(double[] x,
 boolean halfWidthEnds,
 double[] coefficients)

Default constructor, assumes constant-width bins. Functional form will be a0 + a1x + a2x^2 + a3x^3 + ... + anx^n.

Parameters:

x - an array of

invalid reference

double

objects.

halfWidthEnds - Specifies that first and last bins are half-width.l

coefficients - Lowest-order coefficients first

Method Details

fX

public double fX(double x)

Evaluates the function at x.

Specified by:

fX in class FunctionDataCurve

Parameters:

x - x

Returns:

f(x)

integralAt

public double integralAt(double x)

Analytical integral at a point.

Specified by:

integralAt in class FunctionDataCurve

Parameters:

x - Point

Returns:

Exact finite integral of 0 to this point

toString

public String toString()

Overrides:

toString in class FunctionDataCurve