blob: f87a1edc6dd8de6f15b6fa73af176b8ddded3ae7 [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <math.h>
#include <algorithm>
#include "base/strings/stringprintf.h"
#include "media/cast/test/utility/test_util.h"
#include "starboard/types.h"
namespace cobalt {
namespace media {
namespace cast {
namespace test {
MeanAndError::MeanAndError(const std::vector<double>& values) {
double sum = 0.0;
double sqr_sum = 0.0;
num_values = values.size();
if (num_values) {
for (size_t i = 0; i < num_values; i++) {
sum += values[i];
sqr_sum += values[i] * values[i];
}
mean = sum / num_values;
std_dev =
sqrt(std::max(0.0, num_values * sqr_sum - sum * sum)) / num_values;
}
}
std::string MeanAndError::AsString() const {
return base::StringPrintf("%f +/- %f", mean, std_dev);
}
} // namespace test
} // namespace cast
} // namespace media
} // namespace cobalt