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java.lang.Objectorg.apache.commons.math.stat.descriptive.AbstractUnivariateStatistic
org.apache.commons.math.stat.descriptive.AbstractStorelessUnivariateStatistic
org.apache.commons.math.stat.descriptive.summary.SumOfLogs
public class SumOfLogs
Returns the sum of the natural logs for this collection of values.
Uses Math.log(double) to compute the logs. Therefore,
NaN.Double.POSITIVE_INFINITY, but at least one value is 0, the
result is Double.NEGATIVE_INFINITY.Double.POSITIVE_INFINITY and
Double.NEGATIVE_INFINITY are among the values, the result is
NaN.
Note that this implementation is not synchronized. If
multiple threads access an instance of this class concurrently, and at least
one of the threads invokes the increment() or
clear() method, it must be synchronized externally.
| Constructor Summary | |
|---|---|
SumOfLogs()
Create a SumOfLogs instance |
|
SumOfLogs(SumOfLogs original)
Copy constructor, creates a new SumOfLogs identical
to the original |
|
| Method Summary | |
|---|---|
void |
clear()
Clears the internal state of the Statistic |
SumOfLogs |
copy()
Returns a copy of the statistic with the same internal state. |
static void |
copy(SumOfLogs source,
SumOfLogs dest)
Copies source to dest. |
double |
evaluate(double[] values,
int begin,
int length)
Returns the sum of the natural logs of the entries in the specified portion of the input array, or Double.NaN if the designated subarray
is empty. |
long |
getN()
Returns the number of values that have been added. |
double |
getResult()
Returns the current value of the Statistic. |
void |
increment(double d)
Updates the internal state of the statistic to reflect the addition of the new value. |
| Methods inherited from class org.apache.commons.math.stat.descriptive.AbstractStorelessUnivariateStatistic |
|---|
equals, evaluate, hashCode, incrementAll, incrementAll |
| Methods inherited from class org.apache.commons.math.stat.descriptive.AbstractUnivariateStatistic |
|---|
test, test |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public SumOfLogs()
public SumOfLogs(SumOfLogs original)
SumOfLogs identical
to the original
original - the SumOfLogs instance to copy| Method Detail |
|---|
public void increment(double d)
increment in interface StorelessUnivariateStatisticincrement in class AbstractStorelessUnivariateStatisticd - the new value.public double getResult()
getResult in interface StorelessUnivariateStatisticgetResult in class AbstractStorelessUnivariateStatisticDouble.NaN if it
has been cleared or just instantiated.public long getN()
getN in interface StorelessUnivariateStatisticpublic void clear()
clear in interface StorelessUnivariateStatisticclear in class AbstractStorelessUnivariateStatistic
public double evaluate(double[] values,
int begin,
int length)
Double.NaN if the designated subarray
is empty.
Throws IllegalArgumentException if the array is null.
See SumOfLogs.
evaluate in interface UnivariateStatisticevaluate in class AbstractStorelessUnivariateStatisticvalues - the input arraybegin - index of the first array element to includelength - the number of elements to include
IllegalArgumentException - if the array is null or the array index
parameters are not validUnivariateStatistic.evaluate(double[], int, int)public SumOfLogs copy()
copy in interface StorelessUnivariateStatisticcopy in interface UnivariateStatisticcopy in class AbstractStorelessUnivariateStatistic
public static void copy(SumOfLogs source,
SumOfLogs dest)
Neither source nor dest can be null.
source - SumOfLogs to copydest - SumOfLogs to copy to
NullPointerException - if either source or dest is null
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