---
id: "M:cAlgo.API.Functions.Sum(cAlgo.API.DataSeries,System.Int32)"
kind: "method"
type: "T:cAlgo.API.Functions"
url: "https://help.ctrader.com/ctrader-algo/references/Collections/DataSeries/Functions/Sum/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# Functions.Sum

Member of [Functions](https://help.ctrader.com/ctrader-algo/references/Collections/DataSeries/Functions/index.md).

## Sum(DataSeries series, int period)

Calculates the sum of a data series, over the specified period.

Environments: Desktop supported · CLI supported · Cloud supported.

C#:

```csharp
public static double Sum(DataSeries series, int period)
```

Python:

```python
Functions.Sum(series: DataSeries, period: int) -> float
```

### Parameters

- `series` (`DataSeries`, Python `DataSeries`): DataSeries of which values are summed
- `period` (`int`, Python `int`): Period of values that are summed prior to current index

### Returns

`double` — The sum of the series for the period

### Examples

C#:

```csharp
var volumeSum = Bars.TickVolumes.Sum(20);
Print("Tick volume of the last 20 bars: {0}", volumeSum);
```

Python:

```python
volumeSum = Functions.Sum(api.Bars.TickVolumes, 20)
api.Print(f"Tick volume of the last 20 bars: {volumeSum}")
```