vec_math
Class ExpressionFunction

java.lang.Object
  vec_math.Node<String>
      vec_math.StringNode
          vec_math.ExpressionNode
              vec_math.ExpressionFunction

All Implemented Interfaces:

Serializable, Function

public class ExpressionFunction
extends ExpressionNode
implements Function

A function from a parseable string expression. The independent variable used for evaluating the function can have any name, but it may be the only variable

See Also:

Serialized Form

Nested Class Summary

static class

ExpressionFunction.Test Test by evaluating an arbitrary function at the provided position.

Constructor Summary

ExpressionFunction(String node)
Constructs a new function like sin(t).

ExpressionFunction(StringNode parent, String root, int level)
Constructs a daugther node.

Method Summary

double

evaluate(double t) The expression is checked for the occurence of the single variable.

Methods inherited from class vec_math.ExpressionNode

getValue, isVariable

Methods inherited from class vec_math.StringNode

getVariables, parseOperator, parseSub, replaceVariable, replaceVariable, setValidOperator

Methods inherited from class vec_math.Node

equals, getLevel, getParent, getParseSource, getSub, getSubAt, getSubNodeNumber, getTie, isFinal, isParsed, isRoot, parse, parse, setParse, setParseSource, setSub, setTie, setValue, toString, traceVariable

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionFunction

public ExpressionFunction(String node)
                   throws ParseException

Constructs a new function like sin(t). The expression isparsed right after the construction and the name of the variable is checked to be compliant with a single, unique name.

Throws:

ParseException

ExpressionFunction

public ExpressionFunction(StringNode parent,
                          String root,
                          int level)

Constructs a daugther node. This constructor is called repeatedly during parsing.

Method Detail

evaluate

public double evaluate(double t)

The expression is checked for the occurence of the single variable. This is replaced with the value supplied and the evaluated number is returned.

Specified by:

evaluate in interface Function