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:
4.3.0
See Also:

  • Field Details

  • Constructor Details

    • 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 Details

    • 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