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java.lang.Object edu.ksu.cis.kdd.util.stat.distribution.Constants edu.ksu.cis.kdd.util.stat.distribution.BetaGamma
Gamma and Beta functions.
Implementation:
Note this class is taken from cern.jet.stat.Gamma, but it's renamed to BetaGamma to avoid naming conflict -- Roby Joehanes
Field Summary |
Fields inherited from class edu.ksu.cis.kdd.util.stat.distribution.Constants |
big, biginv, LOGPI, MACHEP, MAXGAM, MAXLOG, MINLOG, SQRTH, SQTPI |
Constructor Summary | |
protected |
BetaGamma()
Makes this class non instantiable, but still let's others inherit from it. |
Method Summary | |
static double |
beta(double a,
double b)
Returns the beta function of the arguments. |
static double |
gamma(double x)
Returns the Gamma function of the argument. |
static double |
incompleteBeta(double aa,
double bb,
double xx)
Returns the Incomplete Beta Function evaluated from zero to xx; formerly named ibeta. |
static double |
incompleteGamma(double a,
double x)
Returns the Incomplete Gamma function; formerly named igamma. |
static double |
incompleteGammaComplement(double a,
double x)
Returns the Complemented Incomplete Gamma function; formerly named igamc. |
static double |
logGamma(double x)
Returns the natural logarithm of the gamma function; formerly named lgamma. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
protected BetaGamma()
Method Detail |
public static double beta(double a, double b) throws java.lang.ArithmeticException
- - | (a) | (b) beta( a, b ) = -----------. - | (a+b)
java.lang.ArithmeticException
public static double gamma(double x) throws java.lang.ArithmeticException
java.lang.ArithmeticException
public static double incompleteBeta(double aa, double bb, double xx) throws java.lang.ArithmeticException
aa
- the alpha parameter of the beta distribution.bb
- the beta parameter of the beta distribution.xx
- the integration end point.
java.lang.ArithmeticException
public static double incompleteGamma(double a, double x) throws java.lang.ArithmeticException
a
- the parameter of the gamma distribution.x
- the integration end point.
java.lang.ArithmeticException
public static double incompleteGammaComplement(double a, double x) throws java.lang.ArithmeticException
a
- the parameter of the gamma distribution.x
- the integration start point.
java.lang.ArithmeticException
public static double logGamma(double x) throws java.lang.ArithmeticException
java.lang.ArithmeticException
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