org.matheclipse.core.builtin.function

Class Take

java.lang.Object

org.matheclipse.core.eval.interfaces.AbstractCoreFunctionEvaluator

org.matheclipse.core.builtin.function.Take

All Implemented Interfaces:

ICoreFunctionEvaluator, IFunctionEvaluator, IEvaluator

public class Take
extends AbstractCoreFunctionEvaluator

Constructor Summary

Constructors

Constructor and Description
Take()

Method Summary

Modifier and Type	Method and Description
IExpr	evaluate(IAST ast, EvalEngine engine) Symbolic evaluation of a function.
void	setUp(ISymbol symbol) Evaluate built-in rules and define Attributes for a function.
IAST	take(IAST list, int level, ISequence[] sequenceSpecifications) Take the list elements according to the sequenceSpecifications for the list indexes.

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

numericEval

Methods inherited from class java.lang.Object

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

Constructor Detail

Take

public Take()

Method Detail

evaluate

public IExpr evaluate(IAST ast,
                      EvalEngine engine)

Description copied from class: AbstractCoreFunctionEvaluator

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 AbstractCoreFunctionEvaluator

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()

take

public IAST take(IAST list,
                 int level,
                 ISequence[] sequenceSpecifications)

Take the list elements according to the sequenceSpecifications for the list indexes.

Parameters:

list -

level - recursion level

sequenceSpecifications - one or more ISequence specifications

Returns:

setUp

public void setUp(ISymbol symbol)

Description copied from class: AbstractCoreFunctionEvaluator

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

Specified by:

setUp in interface IEvaluator

Overrides:

setUp in class AbstractCoreFunctionEvaluator

Parameters:

symbol - the symbol which should be set up