org.matheclipse.core.reflection.system

Class Log

java.lang.Object

org.matheclipse.core.eval.interfaces.AbstractEvaluator

org.matheclipse.core.eval.interfaces.AbstractFunctionEvaluator

org.matheclipse.core.eval.interfaces.AbstractArg12

org.matheclipse.core.reflection.system.Log

All Implemented Interfaces:

IFunctionEvaluator, INumeric, IEvaluator, LogRules

public class Log
extends AbstractArg12
implements INumeric, LogRules

See Wikipedia - Logarithm

Field Summary

Fields inherited from interface org.matheclipse.core.reflection.system.rules.LogRules

RULES, SIZES

Constructor Summary

Constructors

Constructor and Description
Log()

Method Summary

Modifier and Type	Method and Description
static IExpr	baseBLog(IInteger b, IInteger arg) Integer logarithm of arg for base b.
IExpr	e1DblArg(INum arg1)
IExpr	e1DblComArg(IComplexNum arg1)
IExpr	e1ObjArg(IExpr expr)
IExpr	e2DblArg(INum arg1, INum arg2)
IExpr	e2IntArg(IInteger arg1, IInteger arg2)
double	evalReal(double[] stack, int top, int size) Evaluate the function to a double number
static BinaryFunctorImpl<IExpr>	getFunction()
IAST	getRuleAST() { Log[1]=0, Log[E]=1, Log[E^(x_Integer)]:=x, Log[E^(x_Rational)]:=x, Log[E^(I)]=I, Log[Exp[-I]]=(-I), Log[0]=(-Infinity) }
void	setUp(ISymbol symbol) Evaluate built-in rules and define Attributes for a function.

Methods inherited from class org.matheclipse.core.eval.interfaces.AbstractArg12

binaryOperator, e1ApcomplexArg, e1ApfloatArg, e1ComArg, e1FraArg, e1FunArg, e1IntArg, e1SymArg, e2ApcomplexArg, e2ApfloatArg, e2ComArg, e2DblComArg, e2FraArg, e2FunArg, e2ObjArg, e2SymArg, eComFraArg, eComIntArg, eFunIntArg, evaluate, unaryOperator

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

createRuleFromMethod, getNormalizedNegativeExpression, getNormalizedNegativeExpression, getPeriodicParts, getPureImaginaryPart, 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

Log

public Log()

Method Detail

getRuleAST

public IAST getRuleAST()

 { Log[1]=0, Log[E]=1, Log[E^(x_Integer)]:=x, Log[E^(x_Rational)]:=x, Log[E^(I)]=I, Log[Exp[-I]]=(-I),
 Log[0]=(-Infinity) }
 

Overrides:

getRuleAST in class AbstractFunctionEvaluator

Returns:

null if no rules are defined

e1DblArg

public IExpr e1DblArg(INum arg1)

Overrides:

e1DblArg in class AbstractArg12

e1DblComArg

public IExpr e1DblComArg(IComplexNum arg1)

Overrides:

e1DblComArg in class AbstractArg12

e2DblArg

public IExpr e2DblArg(INum arg1,
                      INum arg2)

Overrides:

e2DblArg in class AbstractArg12

e2IntArg

public IExpr e2IntArg(IInteger arg1,
                      IInteger arg2)

Overrides:

e2IntArg in class AbstractArg12

baseBLog

public static IExpr baseBLog(IInteger b,
                             IInteger arg)

Integer logarithm of arg for base b. Gives Log _b(arg) or Log(arg)/Log(b).

Parameters:

b - the base of the logarithm

arg -

Returns:

getFunction

public static BinaryFunctorImpl<IExpr> getFunction()

evalReal

public double evalReal(double[] stack,
                       int top,
                       int size)

Description copied from interface: INumeric

Evaluate the function to a double number

Specified by:

evalReal in interface INumeric

Returns:

See Also:

DoubleStackEvaluator

setUp

public void setUp(ISymbol symbol)
           throws SyntaxError

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

Throws:

SyntaxError

e1ObjArg

public IExpr e1ObjArg(IExpr expr)

Overrides:

e1ObjArg in class AbstractArg12