com.singularsys.jep.functions
Class Logarithm
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
Speedup by using static final fields.
Change to use Java 5 Math.log10() method.
- See Also:
- Serialized Form
Field Summary |
protected boolean |
strict
|
Constructor Summary |
Logarithm()
Standard constructor, returns complex results for negative arguments |
Logarithm(boolean strict)
Constructor with control for behaviour for complex results |
Method Summary |
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.PostfixMathCommand |
asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, checkStack, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
strict
protected final boolean strict
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
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
Copyright © 2010 Singular Systems http://www.singularsys.com/jep