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functions: exponential moving average

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This commit is contained in:
Alexander Zobnin
2017-07-03 23:01:18 +03:00
parent 273e6df7e3
commit f3ee574619
12 changed files with 89 additions and 4 deletions
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17
dist/datasource-zabbix/timeseries.js vendored
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@@ -252,6 +252,22 @@ System.register(['lodash', './utils'], function (_export, _context) {
return sma;
}
function expMovingAverage(datapoints, a) {
var ema = [datapoints[0]];
var ema_prev = datapoints[0][POINT_VALUE];
var ema_cur = void 0;
for (var i = 1; i < datapoints.length; i++) {
if (datapoints[i][POINT_VALUE] !== null) {
ema_cur = a * datapoints[i][POINT_VALUE] + (1 - a) * ema_prev;
ema_prev = ema_cur;
ema.push([ema_cur, datapoints[i][POINT_TIMESTAMP]]);
} else {
ema.push([null, datapoints[i][POINT_TIMESTAMP]]);
}
}
return ema;
}
function COUNT(values) {
return values.length;
}
@@ -395,6 +411,7 @@ System.register(['lodash', './utils'], function (_export, _context) {
delta: delta,
rate: rate,
simpleMovingAverage: simpleMovingAverage,
expMovingAverage: expMovingAverage,
SUM: SUM,
COUNT: COUNT,
AVERAGE: AVERAGE,