Expression class abstract

Any Expression supports basic mathematical operations like addition, subtraction, multiplication, division, power and negate.

Furthermore, any expression can be differentiated with respect to a given variable. Also expressions know how to simplify themselves.

There are different classes of expressions:

• Literals (see Literal)

  • Number Literals (see Number)
  • Variable Literals (see Variable)
  • Vector Literals (see Vector)
  • Interval Literals (see IntervalLiteral)

• Operators (support auto-wrapping of parameters into Literals)

  • Unary Operators (see UnaryOperator)
  • Binary Operators (see BinaryOperator)

• Functions (see MathFunction)

  • Pre-defined Functions (see DefaultFunction)
  • Composite Functions (see CompositeFunction)
  • Custom Functions (see CustomFunction)

Pre-defined functions are Exponential, Log, Ln, nth-Root, Sqrt, Abs, Ceil, Floor, Sgn, Sin, Cos, Tan, Asin, Acos and Atan.

Implementers

• BinaryOperator
• Literal
• MathFunction
• UnaryOperator

Constructors

Expression()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

derive(String toVar) → Expression

Derives this expression with respect to the given variable.

evaluate(EvaluationType type, ContextModel context) → dynamic

Evaluates this expression according to given type and context.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

simplify() → Expression

Returns a simplified version of this expression. Subclasses should overwrite this method, if applicable.

toString() → String

Returns a string version of this expression. Subclasses should override this method. The output should be kept compatible with the Parser.

override

Operators

operator %(Expression exp) → Expression

Modulo operator. Creates a Modulo expression.

operator *(Expression exp) → Expression

Multiply operator. Creates a Times expression.

operator +(Expression exp) → Expression

Add operator. Creates a Plus expression.

operator -(Expression exp) → Expression

Subtract operator. Creates a Minus expression.

operator /(Expression exp) → Expression

Divide operator. Creates a Divide expression.

operator ==(Object other) → bool

The equality operator.

inherited

operator ^(Expression exp) → Expression

Power operator. Creates a Power expression.

operator unary-() → Expression

Unary minus operator. Creates a UnaryMinus expression.