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Fixed, documented NaN handling. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141350 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-06-29 14:50:21 +00:00
parent c1062adc04
commit c24f331cb6
1 changed files with 10 additions and 9 deletions
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19
src/java/org/apache/commons/math/stat/univariate/summary/Sum.java
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@ -20,9 +20,12 @@ import java.io.Serializable;
import org.apache.commons.math.stat.univariate.AbstractStorelessUnivariateStatistic;
/**
* The sum of the values that have been added to Univariate.
*
* @version $Revision: 1.20 $ $Date: 2004/06/23 16:26:16 $
* Returns the sum of the available values.
* <p>
* If there are no values in the dataset, or any of the values are
* <code>NaN</code>, then <code>NaN</code> is returned.
*
* @version $Revision: 1.21 $ $Date: 2004/06/29 14:50:21 $
*/
public class Sum extends AbstractStorelessUnivariateStatistic implements Serializable {
@ -41,7 +44,7 @@ public class Sum extends AbstractStorelessUnivariateStatistic implements Seriali
* @see org.apache.commons.math.stat.univariate.StorelessUnivariateStatistic#increment(double)
*/
public void increment(final double d) {
if (Double.isNaN(value)) {
if (n == 0) {
value = d;
} else {
value += d;
@ -72,17 +75,15 @@ public class Sum extends AbstractStorelessUnivariateStatistic implements Seriali
}
/**
* The sum of the values that have been added to Univariate.
* The sum of the values that have been added.
*
* @param values Is a double[] containing the values
* @param begin processing at this point in the array
* @param length the number of elements to include
* @return the sum of the values or Double.NaN if the array is empty
* @see org.apache.commons.math.stat.univariate.UnivariateStatistic#evaluate(double[], int, int)
*/
public double evaluate(
final double[] values,
final int begin,
final int length) {
public double evaluate(final double[] values, final int begin, final int length) {
double sum = Double.NaN;
if (test(values, begin, length)) {
sum = 0.0;