psteitz 2004/01/26 18:43:44
Modified: math/src/java/org/apache/commons/math/stat
SummaryStatisticsImpl.java
Log:
Eliminated unecessary first moment computations.
Revision Changes Path
1.2 +3 -9
jakarta-commons/math/src/java/org/apache/commons/math/stat/SummaryStatisticsImpl.java
Index: SummaryStatisticsImpl.java
===================================================================
RCS file:
/home/cvs/jakarta-commons/math/src/java/org/apache/commons/math/stat/SummaryStatisticsImpl.java,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -r1.1 -r1.2
--- SummaryStatisticsImpl.java 25 Jan 2004 21:30:41 -0000 1.1
+++ SummaryStatisticsImpl.java 27 Jan 2004 02:43:44 -0000 1.2
@@ -73,11 +73,8 @@
/** count of values that have been added */
protected long n = 0;
-
- /** FirstMoment is used to compute the mean */
- protected FirstMoment firstMoment = null;
- /** SecondMoment is used to compute the variance */
+ /** SecondMoment is used to compute the mean and variance */
protected SecondMoment secondMoment = null;
/** sum of values that have been added */
@@ -115,7 +112,6 @@
sumLog = new SumOfLogs();
geoMean = new GeometricMean();
secondMoment = new SecondMoment();
- firstMoment = new FirstMoment();
}
/**
@@ -130,7 +126,6 @@
max.increment(value);
sumLog.increment(value);
geoMean.increment(value);
- firstMoment.increment(value);
secondMoment.increment(value);
n++;
}
@@ -168,7 +163,7 @@
* @return the mean
*/
public double getMean() {
- return new Mean(firstMoment).getResult();
+ return new Mean(secondMoment).getResult();
}
/**
@@ -262,7 +257,6 @@
sumLog.clear();
sumsq.clear();
geoMean.clear();
- firstMoment.clear();
secondMoment.clear();
}
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