public class Sum extends AbstractStorelessUnivariateStatistic implements AggregatableStatistic<Sum>, WeightedEvaluation, Serializable
If there are no values in the dataset, then 0 is returned.
If any of the values are
NaN, then NaN is returned.
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 and Description |
|---|
Sum()
Create a Sum instance.
|
Sum(Sum original)
Copy constructor, creates a new
Sum identical
to the original. |
| Modifier and Type | Method and Description |
|---|---|
void |
aggregate(Sum other)
Aggregates the results from the provided instance into this instance.
|
void |
clear()
Clears the internal state of the Statistic
|
Sum |
copy()
Returns a copy of the statistic with the same internal state.
|
double |
evaluate(double[] values,
double[] weights,
int begin,
int length)
The weighted sum of the entries in the specified portion of
the input array, or 0 if the designated subarray
is empty.
|
double |
evaluate(double[] values,
int begin,
int length)
The sum of the entries in the specified portion of the input array,
or 0 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.
|
equals, hashCodeclone, finalize, getClass, notify, notifyAll, toString, wait, wait, waitaggregate, aggregateevaluateincrementAll, incrementAllevaluatepublic Sum()
public Sum(Sum original) throws NullArgumentException
Sum identical
to the original.original - the Sum instance to copyNullArgumentException - if original is nullpublic 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 AbstractStorelessUnivariateStatisticpublic void aggregate(Sum other)
This method can be used to combine statistics computed over partitions or subsamples - i.e., the value of this instance after this operation should be the same as if a single statistic would have been applied over the combined dataset.
aggregate in interface AggregatableStatistic<Sum>other - the instance to aggregate into this instancepublic double evaluate(double[] values,
int begin,
int length)
throws MathIllegalArgumentException
evaluate in interface StorelessUnivariateStatisticevaluate in interface UnivariateStatisticevaluate in interface MathArrays.Functionvalues - the input arraybegin - index of the first array element to includelength - the number of elements to includeMathIllegalArgumentException - if the array is null or the array index
parameters are not validUnivariateStatistic.evaluate(double[], int, int)public double evaluate(double[] values,
double[] weights,
int begin,
int length)
throws MathIllegalArgumentException
Throws MathIllegalArgumentException if any of the following are true:
Uses the formula,
weighted sum = Σ(values[i] * weights[i])
evaluate in interface WeightedEvaluationvalues - the input arrayweights - the weights arraybegin - index of the first array element to includelength - the number of elements to includeMathIllegalArgumentException - if the parameters are not validpublic Sum copy()
copy in interface StorelessUnivariateStatisticcopy in interface UnivariateStatisticcopy in class AbstractStorelessUnivariateStatisticCopyright © 2016 Hipparchus.org. All rights reserved.