Package org.mariuszgromada.math.mxparser

Class Constant

java.lang.Object

org.mariuszgromada.math.mxparser.PrimitiveElement

org.mariuszgromada.math.mxparser.Constant

public class Constant
extends PrimitiveElement

Constant class provides ability to declare constants. Constants can be used in further processing by any expression, dependent or recursive argument, function, etc...

When creating a constant you should avoid names reserved as parser keywords, in general words known in mathematical language as function names, operators (for example: sin, cos, +, -, pi, e, etc...). Please be informed that after associating the constant with the expression, function or dependent/recursive argument its name will be recognized by the parser as reserved key word. It means that it could not be the same as any other key word known by the parser for this particular expression.

Version:

5.0.0

Author:

Mariusz Gromada
MathParser.org - mXparser project page
mXparser on GitHub
INFIMA place to purchase a commercial MathParser.org-mXparser software license
info@mathparser.org
ScalarMath.org - a powerful math engine and math scripting language
Scalar Lite
Scalar Pro
MathSpace.pl

See Also:

RecursiveArgument, Expression, Function, Argument

Field Summary

Fields

Modifier and Type	Field	Description
static boolean	NO_SYNTAX_ERRORS	Status of the Expression syntax
static int	NOT_FOUND	When constant could not be found
static boolean	SYNTAX_ERROR_OR_STATUS_UNKNOWN
static String	TYPE_DESC
static int	TYPE_ID	Type identifier for constants

Constructor Summary

Constructors

Constructor	Description
Constant(String constantName, double constantValue)	Constructor - creates constant with a given name and given value
Constant(String constantName, double constantValue, String description)	Constructor - creates constant with a given name and given value.
Constant(String constantDefinitionString, PrimitiveElement... elements)	Constructor for function definition in natural math language, for instance providing on string "f(x,y) = sin(x) + cos(x)" is enough to define function "f" with parameters "x and y" and function body "sin(x) + cos(x)".

Method Summary

Modifier and Type	Method	Description
String	getConstantName()	Gets constant name
double	getConstantValue()	Gets constant value.
String	getDescription()	Gets constant description.
String	getErrorMessage()	Method return error message after
boolean	getSyntaxStatus()	Gets syntax status of the expression.
void	setConstantName(String constantName)	Sets constant name.
void	setConstantValue(double constantValue)	Sets constant value
void	setDescription(String description)	Sets constant description.

Methods inherited from class org.mariuszgromada.math.mxparser.PrimitiveElement

getMyTypeId

Methods inherited from class java.lang.Object

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

Field Detail

NOT_FOUND

public static final int NOT_FOUND

When constant could not be found

See Also:

Constant Field Values

TYPE_ID

public static final int TYPE_ID

Type identifier for constants

See Also:

Constant Field Values

TYPE_DESC

public static final String TYPE_DESC

See Also:

Constant Field Values

NO_SYNTAX_ERRORS

public static final boolean NO_SYNTAX_ERRORS

Status of the Expression syntax

See Also:

Constant Field Values

SYNTAX_ERROR_OR_STATUS_UNKNOWN

public static final boolean SYNTAX_ERROR_OR_STATUS_UNKNOWN

See Also:

Constant Field Values

Constructor Detail

Constant

public Constant(String constantName,
                double constantValue)

Constructor - creates constant with a given name and given value

Parameters:

constantName - the constant name

constantValue - the constant value

Constant

public Constant(String constantName,
                double constantValue,
                String description)

Constructor - creates constant with a given name and given value. Additionally description is being set.

Parameters:

constantName - the constant name

constantValue - the constant value

description - the constant description

Constant

public Constant(String constantDefinitionString,
                PrimitiveElement... elements)

Constructor for function definition in natural math language, for instance providing on string "f(x,y) = sin(x) + cos(x)" is enough to define function "f" with parameters "x and y" and function body "sin(x) + cos(x)".

Parameters:

constantDefinitionString - Constant definition in the form of one String, ie "c = 2" or "c = 2*sin(pi/3)"

elements - Optional parameters (comma separated) such as Arguments, Constants, Functions

Method Detail

getConstantName

public String getConstantName()

Gets constant name

Returns:

the constant name as string.

setConstantName

public void setConstantName(String constantName)

Sets constant name. If constant is associated with any expression then this operation will set modified flag to each related expression.

Parameters:

constantName - the constant name

setConstantValue

public void setConstantValue(double constantValue)

Sets constant value

Parameters:

constantValue - constant value

getConstantValue

public double getConstantValue()

Gets constant value.

Returns:

constant value as double

getDescription

public String getDescription()

Gets constant description.

Returns:

constant description as string.

setDescription

public void setDescription(String description)

Sets constant description.

Parameters:

description - the constant description

getErrorMessage

public String getErrorMessage()

Method return error message after

Returns:

Error message as string.

getSyntaxStatus

public boolean getSyntaxStatus()

Gets syntax status of the expression.

Returns:

Constant.NO_SYNTAX_ERRORS if there are no syntax errors, Const.SYNTAX_ERROR_OR_STATUS_UNKNOWN when syntax error was found or syntax status is unknown