data
Class StandardNormalTable

java.lang.Object
  edu.hws.jcm.functions.FunctionParserExtension
      edu.hws.jcm.functions.TableFunction
          data.StandardNormalTable

All Implemented Interfaces:

ExpressionCommand, Function, MathObject, ParserExtension, java.io.Serializable

public class StandardNormalTable
extends TableFunction

StandardNormalTable

This class manage a reduced centered normal law table. The table values must be stocked in a file in the following format :

• the number of points to read on the first line
• the value in x and y seperated by a blank space

To use the function, it must be registered with a parser, or even better, call the constructor with a specified parser.

Copyright(c) 2005 Université Laval, LSFM research group.

Version:

1.0

Author:

Nicolas Richard

See Also:

Serialized Form

Field Summary

Fields inherited from class edu.hws.jcm.functions.TableFunction

PIECEWISE_LINEAR, SMOOTH, STEP, STEP_LEFT, STEP_RIGHT

Fields inherited from class edu.hws.jcm.functions.FunctionParserExtension

name

Constructor Summary

StandardNormalTable()
Default constructor without parameters.

StandardNormalTable(java.lang.String file)
Constructor with a specified file.

StandardNormalTable(java.lang.String file, Parser p, Variable y)
Constructir with a file and parser specified.

Method Summary

void	apply(StackOfDouble stack, Cases cases) Returns the evaluation of the function using the real number on the top of the stack as a parameter.
double	getVal(double v) Get the value of the function with the specified v value.
double	getVal(double[] args) This function can compute no more than one value of v.
double	getValueWithCases(double[] params, Cases cases) This function is simply a wrapper.
java.lang.String	toString() Returns a string representing the normal law.

Methods inherited from class edu.hws.jcm.functions.TableFunction

addIntervals, addPoint, addPoints, copyDataFrom, dependsOn, derivative, derivative, findPoint, getArity, getPointCount, getStyle, getX, getY, removeAllPoints, removePointAt, setStyle, setY

Methods inherited from class edu.hws.jcm.functions.FunctionParserExtension

appendOutputString, compileDerivative, doParse, extent, getName, setName, setParensCanBeOptional

Methods inherited from class java.lang.Object

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

Constructor Detail

StandardNormalTable

public StandardNormalTable()

Default constructor without parameters. Will load the file called "StandardNormalTable.txt".

StandardNormalTable

public StandardNormalTable(java.lang.String file)

Constructor with a specified file. Will load the standard normal table from an alternate file. * The table values must be stocked in a file in the following format :

• the number of points to read on the first line
• the value in x and y seperated by a blank space

Parameters:

file - the file from which to load the table.

StandardNormalTable

public StandardNormalTable(java.lang.String file,
                           Parser p,
                           Variable y)

Constructir with a file and parser specified. The table will be loadeed from the file, then registered with the parser. This is the fastest way of using a normal table.

Parameters:

file - the file name from which to load the table

p - the parser with which the table will be registered

y - the variable to be evaluated

See Also:

StandardNormalTable#StandardNormalTable(File)

Method Detail

getVal

public double getVal(double v)

Get the value of the function with the specified v value.

Overrides:

getVal in class TableFunction

Parameters:

v - value of the variable in the function.

Returns:

value computated using v as the variable's value.

getVal

public double getVal(double[] args)

This function can compute no more than one value of v. We simply pass the first element to getVal(double)

Specified by:

getVal in interface Function

Overrides:

getVal in class TableFunction

Parameters:

args - a list of real numbers to evaluate

Returns:

the evaluation of the fuction using the first element of the list

See Also:

getVal(double)

getValueWithCases

public double getValueWithCases(double[] params,
                                Cases cases)

This function is simply a wrapper. It calls the getVal function with the list of real numbers, dropping along the cases.

Specified by:

getValueWithCases in interface Function

Overrides:

getValueWithCases in class TableFunction

Parameters:

params - a list of real numbers to evaluate

cases - ignored

Returns:

the evaluation of the first number contained in the list

apply

public void apply(StackOfDouble stack,
                  Cases cases)

Returns the evaluation of the function using the real number on the top of the stack as a parameter.

Specified by:

apply in interface ExpressionCommand

Overrides:

apply in class TableFunction

Parameters:

stack - a stack containg doubles

cases - ignored

toString

public java.lang.String toString()

Returns a string representing the normal law. The string returned is in the form of NAME((Y - mu) / sigma), where NAME is usually "Normal" and where Y is the variable specified in the constructor or simply "y" if unspecified.

Overrides:

toString in class java.lang.Object

Returns:

a string representing the normal function.