diff options
Diffstat (limited to 'lib/classes/Timer.php')
| -rw-r--r-- | lib/classes/Timer.php | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/lib/classes/Timer.php b/lib/classes/Timer.php index 8d5ec95..df5c150 100644 --- a/lib/classes/Timer.php +++ b/lib/classes/Timer.php @@ -44,11 +44,33 @@ final class Timer } $res = []; foreach ($deltas as $timer_name => $data) { - $res[$timer_name] = array_sum($data)/count($data); + $res[$timer_name]['avg'] = array_sum($data)/count($data); + $res[$timer_name]['std_dev'] = $this->standard_deviation($data); + $res[$timer_name]['data'] = $data; } return $res; } + //src: https://www.geeksforgeeks.org/php-program-find-standard-deviation-array/ + private function standard_deviation($array): float + { + $num_of_elements = count($array); + + $variance = 0.0; + + // calculating mean using array_sum() method + $average = array_sum($array)/$num_of_elements; + + foreach($array as $i) + { + // sum of squares of differences between + // all numbers and means. + $variance += pow(($i - $average), 2); + } + + return (float)sqrt($variance/$num_of_elements); + } + private function compute_delta($data) { if (isset($data['start']) && isset($data['end'])) { |