Logarithm (Jep with extensions API )

java.lang.Object
- com.singularsys.jep.functions.PostfixMathCommand
- - com.singularsys.jep.functions.UnaryFunction
  - - com.singularsys.jep.functions.Logarithm

All Implemented Interfaces:

PostfixMathCommandI, RealUnaryFunction, java.io.Serializable
```
public class Logarithm
extends UnaryFunction
implements RealUnaryFunction
```
Log base 10. By default negative arguments will return a complex result
```
log(|x|) + pi i
```
if the strict flag is set in the constructor
version 3.4: Speedup by using static final fields.
version 3.4: Change to use Java 5 Math.log10() method.
version 3.5: For negative arguments log10(-x) =log10(x) + i pi log10(e) as 10^(log10(x) + i log10(e)) = x * e^(i pi) = -x. For complex arguments(x+i y) = r e^(i th) log10(r e^(i th)) = log10(r) + i th log10(e) as 10^(log10(r) + i th log10(e)) = r * e^(i th).
See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

protected boolean strict
- Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand
  curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Constructors
Constructor	Description
`Logarithm()`	Standard constructor, returns complex results for negative arguments
`Logarithm(boolean strict)`	Constructor with control for behaviour for complex results

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.Object`	`eval(java.lang.Object arg)`
`double`	`evaluate(double val)`
`java.lang.Object`	`log(java.lang.Object param)`

Methods inherited from class com.singularsys.jep.functions.UnaryFunction
instanceOf, instanceOf, run

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand
asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString, toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - strict
```
protected final boolean strict
```
- Constructor Detail
  - Logarithm
```
public Logarithm(boolean strict)
```
    Constructor with control for behaviour for complex results
    
    Parameters:
    
    strict - if true negative real arguments return NaN, otherwise complex results are returned
  - Logarithm
```
public Logarithm()
```
    Standard constructor, returns complex results for negative arguments
- Method Detail
  - eval
```
public java.lang.Object eval(java.lang.Object arg)
                      throws EvaluationException
```
    Specified by:
    
    eval in class UnaryFunction
    
    Throws:
    
    EvaluationException
  - log
```
public java.lang.Object log(java.lang.Object param)
                     throws EvaluationException
```
    Throws:
    
    EvaluationException
  - evaluate
```
public double evaluate(double val)
```
    Specified by:
    
    evaluate in interface RealUnaryFunction