---
id: "M:cAlgo.API.Internals.IIndicatorsAccessor.RelativeStrengthIndex(cAlgo.API.DataSeries,System.Int32)"
kind: "method"
type: "T:cAlgo.API.Internals.IIndicatorsAccessor"
url: "https://help.ctrader.com/ctrader-algo/references/Indicators/IIndicatorsAccessor/RelativeStrengthIndex/"
---

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

# IIndicatorsAccessor.RelativeStrengthIndex

Member of [IIndicatorsAccessor](https://help.ctrader.com/ctrader-algo/references/Indicators/IIndicatorsAccessor/index.md).

## RelativeStrengthIndex(DataSeries source, int periods)

The Relative Strength Index indicator measures turns in price by measuring turns in momentum.

Environments: Desktop supported · CLI supported · Cloud supported.

C#:

```csharp
RelativeStrengthIndex RelativeStrengthIndex(DataSeries source, int periods)
```

Python:

```python
api.Indicators.RelativeStrengthIndex(source: DataSeries, periods: int) -> RelativeStrengthIndex
```

### Parameters

- `source` (`DataSeries`, Python `DataSeries`): The source data used for calculation.
- `periods` (`int`, Python `int`): The value of the periods used for calculation.

### Returns

`RelativeStrengthIndex` — Relative Strength indicator instance

### Examples

C#:

```csharp
var rsi = Indicators.RelativeStrengthIndex(Bars.ClosePrices, 14);
if (rsi.Result.LastValue > 70)
    Print("RSI(14) is overbought: {0}", rsi.Result.LastValue);
```

Python:

```python
rsi = api.Indicators.RelativeStrengthIndex(api.Bars.ClosePrices, 14)
if rsi.Result.LastValue > 70:
    api.Print(f"RSI(14) is overbought: {rsi.Result.LastValue}")
```