1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.rs.imagejb; 18 19 import java.util.ArrayList; 20 21 class Result { 22 23 private ArrayList<Float> timeList; 24 Result()25 Result() { 26 timeList = new ArrayList<Float>(); 27 } 28 29 // Add time add(float time)30 public void add(float time) { 31 timeList.add(time); 32 } 33 34 // Get total execution time getTotalTime()35 public float getTotalTime() { 36 float total = 0.0f; 37 for (float time : timeList) { 38 total += time; 39 } 40 return total; 41 } 42 43 // Get number of iterations getIterations()44 public int getIterations() { 45 return timeList.size(); 46 } 47 48 // Get the average of an array list getAvg()49 public float getAvg() { 50 return getTotalTime() / getIterations(); 51 } 52 53 // Get the biased ("full population") standard deviation getStdevp()54 public float getStdevp() { 55 float sumSqDiff = 0; 56 float avg = getAvg(); 57 for (float time : timeList) { 58 float diff = time - avg; 59 sumSqDiff += diff * diff; 60 } 61 return (float) Math.sqrt(sumSqDiff / getIterations()); 62 } 63 64 // Get the normalized standard deviation ("standard deviation coefficient") getStdCoef()65 public float getStdCoef() { 66 return getStdevp() / getAvg(); 67 } 68 69 // Get all times as float[] getTimes()70 public float[] getTimes() { 71 float[] array = new float[getIterations()]; 72 for (int i = 0; i < getIterations(); i++) { 73 array[i] = timeList.get(i); 74 } 75 return array; 76 } 77 } 78