lt.monarch.math
Class FormulaParser

java.lang.Object
  lt.monarch.math.AbstractFormulaParser
      lt.monarch.math.FormulaParser

All Implemented Interfaces:

java.io.Serializable

public class FormulaParser
extends AbstractFormulaParser

Parses the formula into the formula tree, which enables to calculate the value of the formula. The x0, x1, x2, x3, x4 and etc. are variables which can be used in the formula and the values of those can be supplied through eval method. In the eval method x0 corresponds to the first element in the array, x1 to the second and etc. Possible functions are: "sin", "cos", "tan", "asin", "acos", "atan", "abs", "exp", "log", "lg", "sqrt", "rad", "deg", "round", "floor", "ceil", "rnd". Also available statistical operations: "mean", "stdev", "variance", e.g. "mean(x0)*stdev(x0)" Possible constants are: "PI", "E". Numbers are double values. Possible operators are: "+", "-", "*", "/", "%", "^".

See Also:

Serialized Form

Nested Class Summary

Modifier and Type	Class and Description

Nested classes/interfaces inherited from class lt.monarch.math.AbstractFormulaParser

AbstractFormulaParser.AbstractNode

Field Summary

Modifier and Type	Field and Description
protected AbstractFormulaParser.AbstractNode	rootNode The root node, that starts the evaluation

Fields inherited from class lt.monarch.math.AbstractFormulaParser

dataModel, nodeHash

Constructor and Description

FormulaParser(java.lang.String formula)
Formula parser constructor

Method Summary

Modifier and Type	Method and Description
void	dispose() Disposes the resources used by the class
double	eval() Evaluates the value of the formula
java.lang.Double	eval(double value) Evaluates the value of the formula
java.lang.Double	eval(java.lang.Double[] values) Evaluates the value of the formula
protected void	finalize()
void	setVariable(java.lang.String variableName, int value) Sets variable value
protected void	setVariables(java.lang.Double[] values) Sets values of the variables

Methods inherited from class lt.monarch.math.AbstractFormulaParser

getDataModel, setDataModel

Methods inherited from class java.lang.Object

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

Field Detail

rootNode

protected AbstractFormulaParser.AbstractNode rootNode

The root node, that starts the evaluation

Constructor Detail

FormulaParser

public FormulaParser(java.lang.String formula)
              throws java.lang.Exception

Formula parser constructor

Parameters:

formula - Formula string

Throws:

java.lang.Exception - Exception if the error occurs while parsing the formula

Method Detail

eval

public double eval()

Evaluates the value of the formula

Returns:

Value of the formula

eval

public java.lang.Double eval(double value)
                      throws java.lang.IllegalArgumentException

Evaluates the value of the formula

Parameters:

value - the variable value which corresponds to x1

Returns:

Value of the formula

Throws:

java.lang.IllegalArgumentException - Throws an exception if number of given values does not meet the number of variables in the formula.

eval

public java.lang.Double eval(java.lang.Double[] values)
                      throws java.lang.IllegalArgumentException

Evaluates the value of the formula

Parameters:

values - the values of variables

Returns:

Value of the formula

Throws:

java.lang.IllegalArgumentException - Throws an exception if number of given values does not meet the number of variables in the formula.

setVariables

protected void setVariables(java.lang.Double[] values)

Sets values of the variables

Parameters:

values - array of variable values

setVariable

public void setVariable(java.lang.String variableName,
                        int value)

Sets variable value

Parameters:

variableName - variable name. Possible names: index, row, column

value - variable value

dispose

public void dispose()

Description copied from class: AbstractFormulaParser

Disposes the resources used by the class

Specified by:

dispose in class AbstractFormulaParser

finalize

protected void finalize()
                 throws java.lang.Throwable

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable