sum
Total over rolling N-period window
sum(source, periods)
Parameters
| Name | Type | Description |
|---|---|---|
source |
field | Data series to sum (close, volume, or any expression) |
periods |
int | Number of bars to include in the sum |
Formula
```
sum(x, n) = x[0] + x[1] + x[2] + ... + x[n-1]
where x[0] is the current bar and x[n-1] is n-1 bars ago
```Examples
// total volume over last 10 days exceeds 50 million
sum(volume, 10) > 50M;// net change over 5 bars (sum of daily changes)
sum(change(close, 1), 5) > 0;// ratio of gains to losses over 14 periods
sum(gain(close), 14) / sum(loss(close), 14) > 1;// these are equivalent: sum = sma * period
sum(close, 20) ~= sma(close, 20) * 20;Returns
Float (total of all values in the rolling window) ## Notes - The window always contains exactly N values (current bar + N-1 previous) - For cumulative totals from the start of data, use cumsum() instead