---
id: "T:cAlgo.API.Indicators.RelativeStrengthIndex"
kind: "interface"
namespace: "cAlgo.API.Indicators"
url: "https://help.ctrader.com/ctrader-algo/references/Indicators/RelativeStrengthIndex/"
---

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

# RelativeStrengthIndex (interface)

The RSI (Wilder) is momentum oscillator, measuring the velocity and magnitude of directional price movements.

Environments: Desktop supported · CLI supported · Cloud supported.

## Definition

```csharp
public interface RelativeStrengthIndex
```

## Remarks

The RSI is most typically used on a 14 day timeframe, measured on a scale from 0 to 100, with high and low levels marked at 70 and 30, respectively. Shorter or longer timeframes are used for alternately shorter or longer outlooks. More extreme high and low levels�80 and 20, or 90 and 10�occur less frequently but indicate stronger momentum.

## Examples

C#:

```csharp
private RelativeStrengthIndex _rsi;
protected override void Initialize()
{
    _rsi = Indicators.RelativeStrengthIndex(Bars.ClosePrices, 14);
}
public override void Calculate(int index)
{
    double result = _rsi.Result[index];
}
```

Python:

```python
import clr
clr.AddReference("cAlgo.API")

from cAlgo.API import *

class Test():
    def initialize(self):
        self.relativeStrengthIndex = api.Indicators.RelativeStrengthIndex(api.Bars.ClosePrices, 14)

    def calculate(self, index):
        result = self.relativeStrengthIndex.Result[index]
```

C#:

```csharp
using cAlgo.API;
using cAlgo.API.Indicators;

namespace cAlgo.Robots
{
    // This sample cBot shows how to use the Relative Strength Index indicator
    public partial class RelativeStrengthIndexSample : Robot
    {
        private double _volumeInUnits;

        private RelativeStrengthIndex _relativeStrengthIndex;

        public Position[] BotPositions
        {
            get
            {
                return Positions.FindAll(Label);
            }
        }

        protected override void OnStart()
        {
            _volumeInUnits = Symbol.QuantityToVolumeInUnits(VolumeInLots);

            _relativeStrengthIndex = Indicators.RelativeStrengthIndex(Bars.ClosePrices, 20);
        }

        protected override void OnBar()
        {
            if (_relativeStrengthIndex.Result.Last(1) > 70 && _relativeStrengthIndex.Result.Last(2) < 70)
            {
                ClosePositions(TradeType.Buy);

                ExecuteMarketOrder(TradeType.Sell, SymbolName, _volumeInUnits, Label, StopLossInPips, TakeProfitInPips);
            }
            else if (_relativeStrengthIndex.Result.Last(1) < 20 && _relativeStrengthIndex.Result.Last(2) > 20)
            {
                ClosePositions(TradeType.Sell);

                ExecuteMarketOrder(TradeType.Buy, SymbolName, _volumeInUnits, Label, StopLossInPips, TakeProfitInPips);
            }
        }

        private void ClosePositions(TradeType tradeType)
        {
            foreach (var position in BotPositions)
            {
                if (position.TradeType != tradeType) continue;

                ClosePosition(position);
            }
        }
    }
}
```

Python:

```python
import clr

clr.AddReference("cAlgo.API")

# Import cAlgo API types
from cAlgo.API import *

# Import trading wrapper functions
from robot_wrapper import *

class RelativeStrengthIndexSample():
    def on_start(self):
        self.volumeInUnits = api.Symbol.QuantityToVolumeInUnits(api.VolumeInLots)
        self.relativeStrengthIndex = api.Indicators.RelativeStrengthIndex(api.Bars.ClosePrices, 20)

    def on_bar_closed(self):
        if self.relativeStrengthIndex.Result.Last(0) > 70 and self.relativeStrengthIndex.Result.Last(1) < 70:
            self.close_positions(TradeType.Buy)
            api.ExecuteMarketOrder(TradeType.Sell, api.SymbolName, self.volumeInUnits, api.Label, api.StopLossInPips, api.TakeProfitInPips)
        elif self.relativeStrengthIndex.Result.Last(0) < 20 and self.relativeStrengthIndex.Result.Last(1) > 20:
            self.close_positions(TradeType.Sell)
            api.ExecuteMarketOrder(TradeType.Buy, api.SymbolName, self.volumeInUnits, api.Label, api.StopLossInPips, api.TakeProfitInPips)

    def get_bot_positions(self):
        return api.Positions.FindAll(api.Label)

    def close_positions(self, tradeType):
        for position in self.get_bot_positions():
            if position.TradeType != tradeType:
                continue
            api.ClosePosition(position)
```

config.json:

```json
{
  "AccessRights": "None",
  "TimeZone": "UTC",
  "Parameters": [
    {
      "Name": "VolumeInLots",
      "DisplayName": "Volume (Lots)",
      "Type": "Double",
      "DefaultValue": 0.01
    },
    {
      "Name": "StopLossInPips",
      "DisplayName": "Stop Loss (Pips)",
      "Type": "Double",
      "DefaultValue": 10
    },
    {
      "Name": "TakeProfitInPips",
      "DisplayName": "Take Profit (Pips)",
      "Type": "Double",
      "DefaultValue": 10
    },
    {
      "Name": "Label",
      "Type": "String",
      "DefaultValue": "Sample"
    }
  ]
}
```

## Properties

- `IndicatorDataSeries Result {get;}` — Gets the resulting time series of the Relative Strength Index indicator calculation. [details](https://help.ctrader.com/ctrader-algo/references/Indicators/RelativeStrengthIndex/Result/index.md)

## Inherited members

- `ChartIndicator AddToChart()` (from StandardIndicator) [details](https://help.ctrader.com/ctrader-algo/references/General/StandardIndicator/AddToChart/index.md)
- `Symbol Symbol {get;}` (from StandardIndicator) [details](https://help.ctrader.com/ctrader-algo/references/General/StandardIndicator/Symbol/index.md)
- `TimeFrame TimeFrame {get;}` (from StandardIndicator) [details](https://help.ctrader.com/ctrader-algo/references/General/StandardIndicator/TimeFrame/index.md)
- `Bars Bars {get;}` (from StandardIndicator) [details](https://help.ctrader.com/ctrader-algo/references/General/StandardIndicator/Bars/index.md)