blob: 192366aef8ea927223864004f038188d58451693 [file] [log] [blame]
/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "test/statistics.h"
#include <math.h>
#include <algorithm>
namespace webrtc {
namespace test {
Statistics::Statistics()
: sum_(0.0),
sum_squared_(0.0),
max_(std::numeric_limits<double>::min()),
min_(std::numeric_limits<double>::max()),
count_(0) {}
void Statistics::AddSample(double sample) {
sum_ += sample;
sum_squared_ += sample * sample;
max_ = std::max(max_, sample);
min_ = std::min(min_, sample);
++count_;
}
double Statistics::Max() const {
return max_;
}
double Statistics::Mean() const {
if (count_ == 0)
return 0.0;
return sum_ / count_;
}
double Statistics::Min() const {
return min_;
}
double Statistics::Variance() const {
if (count_ == 0)
return 0.0;
return sum_squared_ / count_ - Mean() * Mean();
}
double Statistics::StandardDeviation() const {
return sqrt(Variance());
}
} // namespace test
} // namespace webrtc