org.matheclipse.core.reflection.system

Class Dimensions

java.lang.Object

org.matheclipse.core.eval.interfaces.AbstractEvaluator

org.matheclipse.core.eval.interfaces.AbstractFunctionEvaluator

org.matheclipse.core.reflection.system.Dimensions

All Implemented Interfaces:

IFunctionEvaluator, IEvaluator

public class Dimensions
extends AbstractFunctionEvaluator

Get the dimensions of an expression

Constructor Summary

Constructors

Constructor and Description
Dimensions()

Method Summary

Modifier and Type	Method and Description
IExpr	evaluate(IAST ast, EvalEngine engine) Symbolic evaluation of a function.
static java.util.ArrayList<java.lang.Integer>	getDimensions(IAST ast, IExpr header, int maxLevel)
static java.util.ArrayList<java.lang.Integer>	getDimensions(IAST ast, IExpr header, int maxLevel, java.util.ArrayList<java.lang.Integer> dims)
void	setUp(ISymbol symbol) Evaluate built-in rules and define Attributes for a function.

Methods inherited from class org.matheclipse.core.eval.interfaces.AbstractFunctionEvaluator

createRuleFromMethod, getNormalizedNegativeExpression, getNormalizedNegativeExpression, getPeriodicParts, getPureImaginaryPart, getRuleAST, initSerializedRules, isNegativeExpression

Methods inherited from class org.matheclipse.core.eval.interfaces.AbstractEvaluator

numericEval

Methods inherited from class java.lang.Object

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

Constructor Detail

Dimensions

public Dimensions()

Method Detail

evaluate

public IExpr evaluate(IAST ast,
                      EvalEngine engine)

Description copied from class: AbstractFunctionEvaluator

Symbolic evaluation of a function. ast.get(0) (or alternatively ast.head()) contains the head (i.e. the function symbol) of this abstract syntax tree (AST).
From ast.arg1() to ast.get(n) the ast contains the first to n-th argument of the function (alternatively you get the first to fifth argument with the methods arg1(), arg2(),... arg5()).
If necessary use the methods from the Validate class to check the number or types of arguments in the evaluate method.
Note: if the symbolic evaluation isn't possible or no result is found the evaluate method returns with a null value without throwing an exception!

Specified by:

evaluate in interface IFunctionEvaluator

Specified by:

evaluate in class AbstractFunctionEvaluator

Parameters:

ast - the abstract syntax tree (AST) which should be evaluated

engine - the users current evaluation engine

Returns:

the evaluated object or null, if evaluation isn't possible

See Also:

Validate, IExpr.head(), IAST.arg1(), IAST.arg2(), IAST.arg3()

getDimensions

public static java.util.ArrayList<java.lang.Integer> getDimensions(IAST ast,
                                                                   IExpr header,
                                                                   int maxLevel)

getDimensions

public static java.util.ArrayList<java.lang.Integer> getDimensions(IAST ast,
                                                                   IExpr header,
                                                                   int maxLevel,
                                                                   java.util.ArrayList<java.lang.Integer> dims)

setUp

public void setUp(ISymbol symbol)

Description copied from class: AbstractFunctionEvaluator

Evaluate built-in rules and define Attributes for a function.

Specified by:

setUp in interface IEvaluator

Overrides:

setUp in class AbstractFunctionEvaluator

Parameters:

symbol - the symbol which should be set up