org.jscience.mathematics.analysis.expressions.symbolic
Class Step

java.lang.Object
  org.jscience.mathematics.analysis.expressions.OperatorExpression
      org.jscience.mathematics.analysis.expressions.TernaryOperator
          org.jscience.mathematics.analysis.expressions.symbolic.Step

All Implemented Interfaces:

java.io.Serializable, Expression, JavaExpressible, XMLExpressible

public class Step
extends TernaryOperator

Class representing the step function.

See Also:

TernaryOperator, Serialized Form

Field Summary

Fields inherited from class org.jscience.mathematics.analysis.expressions.TernaryOperator

secondOperand, thirdOperand

Fields inherited from class org.jscience.mathematics.analysis.expressions.OperatorExpression

firstOperand

Constructor Summary

Step(Expression steptime, Expression stepvalue)
Creates an object that represent the step function.

Step(Expression time, Expression steptime, Expression stepvalue)
Creates an object that represents the step function.

Method Summary

boolean	equals(java.lang.Object e) DOCUMENT ME!
double	eval() DOCUMENT ME!
boolean	isDifferentiable() The step function is not differentiable so we override the inherited isDifferentiable method.
boolean	isExpandable() The step function is not expandable so we override the inherited isExpandable method.
Expression	optimize() DOCUMENT ME!
Expression	replace(Expression a, Expression b) DOCUMENT ME!
java.lang.String	toJava() DOCUMENT ME!
java.lang.String	toString() DOCUMENT ME!
java.lang.String	toXML() DOCUMENT ME!

Methods inherited from class org.jscience.mathematics.analysis.expressions.TernaryOperator

diff, getElements, getSecondOperand, getThirdOperand, setSecondOperand, setThirdOperand, toTaylorMap

Methods inherited from class org.jscience.mathematics.analysis.expressions.OperatorExpression

contains, factor, getFirstOperand, isolate, isolate, setFirstOperand

Methods inherited from class java.lang.Object

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

Constructor Detail

Step

public Step(Expression time,
            Expression steptime,
            Expression stepvalue)

Creates an object that represents the step function. If the first expression evaluates to a value larger than or equal to the second expression, the step value is returned. If not zero is returned.

Parameters:

time - Usually the normal time

steptime - The time from which the step function should be stepvalue rather than zero

stepvalue - The value to which the step function steps at time steptime

Step

public Step(Expression steptime,
            Expression stepvalue)

Creates an object that represent the step function.

Parameters:

steptime - DOCUMENT ME!

stepvalue - DOCUMENT ME!

Method Detail

eval

public double eval()

DOCUMENT ME!

Returns:

DOCUMENT ME!

isDifferentiable

public boolean isDifferentiable()

The step function is not differentiable so we override the inherited isDifferentiable method.

Specified by:

isDifferentiable in interface Expression

Overrides:

isDifferentiable in class TernaryOperator

Returns:

DOCUMENT ME!

See Also:

Expression.isDifferentiable()

isExpandable

public boolean isExpandable()

The step function is not expandable so we override the inherited isExpandable method.

Specified by:

isExpandable in interface Expression

Overrides:

isExpandable in class TernaryOperator

Returns:

DOCUMENT ME!

See Also:

Expression.isExpandable()

replace

public Expression replace(Expression a,
                          Expression b)

DOCUMENT ME!

Parameters:

a - DOCUMENT ME!

b - DOCUMENT ME!

Returns:

DOCUMENT ME!

equals

public boolean equals(java.lang.Object e)

DOCUMENT ME!

Overrides:

equals in class java.lang.Object

Parameters:

e - DOCUMENT ME!

Returns:

DOCUMENT ME!

toString

public java.lang.String toString()

DOCUMENT ME!

Overrides:

toString in class java.lang.Object

Returns:

DOCUMENT ME!

toJava

public java.lang.String toJava()

DOCUMENT ME!

Returns:

DOCUMENT ME!

optimize

public Expression optimize()

DOCUMENT ME!

Returns:

DOCUMENT ME!

toXML

public java.lang.String toXML()

DOCUMENT ME!

Returns:

DOCUMENT ME!