Author: sebb
Date: Tue May 9 11:04:47 2006
New Revision: 405491
URL: http://svn.apache.org/viewcvs?rev=405491&view=rev
Log:
Add cheaper calculator (no need to save results)
Added:
jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java
Added:
jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java
URL:
http://svn.apache.org/viewcvs/jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java?rev=405491&view=auto
==============================================================================
---
jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java
(added)
+++
jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java
Tue May 9 11:04:47 2006
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2006 The Apache Software Foundation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.jorphan.math;
+
+/**
+ * Class to calculate various items that don't require all previous results to
be saved:
+ * - mean = average
+ * - standard deviation
+ * - minimum
+ * - maximum
+ */
+public class Calculator {
+
+ private double sum = 0;
+
+ private double sumOfSquares = 0;
+
+ private double mean = 0;
+
+ private double deviation = 0;
+
+ private int count = 0;
+
+ private long bytes = 0;
+
+ private long maximum = Long.MIN_VALUE;
+
+ private long minimum = Long.MAX_VALUE;
+
+ public void clear() {
+ maximum = Long.MIN_VALUE;
+ minimum = Long.MAX_VALUE;
+ sum = 0;
+ sumOfSquares = 0;
+ mean = 0;
+ deviation = 0;
+ count = 0;
+ }
+
+ public void addValue(long newValue) {
+ count++;
+ minimum=Math.min(newValue, minimum);
+ maximum=Math.max(newValue, maximum);
+ double currentVal = newValue;
+ sum += currentVal;
+ sumOfSquares += currentVal * currentVal;
+ // Calculate each time, as likely to be called for each add
+ mean = sum / count;
+ deviation = Math.sqrt((sumOfSquares / count) - (mean * mean));
+ }
+
+
+ public void addBytes(long newValue) {
+ bytes += newValue;
+ }
+
+ public long getTotalBytes() {
+ return bytes;
+ }
+
+
+ public double getMean() {
+ return mean;
+ }
+
+ public double getStandardDeviation() {
+ return deviation;
+ }
+
+ public long getMin() {
+ return minimum;
+ }
+
+ public long getMax() {
+ return maximum;
+ }
+
+ public int getCount() {
+ return count;
+ }
+}
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