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

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

# WilliamsPctR (interface)

Williams %R is an effective momentum oscillator and was described by Larry Williams for the first time in 1973.

Environments: Desktop supported · CLI supported · Cloud supported.

## Definition

```csharp
public interface WilliamsPctR
```

## Remarks

It shows the relationship of the close relative to the high-low range over a set period of time.

## Examples

C#:

```csharp
private WilliamsPctR _williamsPctR;
protected override void Initialize()
{
    _williamsPctR = Indicators.WilliamsPctR(14);
}
public override void Calculate(int index)
{
    double result = _williamsPctR.Result[index];
}
```

Python:

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

from cAlgo.API import *

class Test():
    def initialize(self):
        self.williamsPctR = api.Indicators.WilliamsPctR(14)

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

C#:

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

namespace cAlgo.Robots
{
    // This sample cBot shows how to use the Williams % R indicator
    public partial class WilliamsPctRSample : Robot
    {
        private double _volumeInUnits;

        private WilliamsPctR _williamsPctR;

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

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

            _williamsPctR = Indicators.WilliamsPctR(14);
        }

        protected override void OnBar()
        {
            if (_williamsPctR.Result.Last(1) > -20 && _williamsPctR.Result.Last(2) < -20)
            {
                ClosePositions(TradeType.Buy);

                ExecuteMarketOrder(TradeType.Sell, SymbolName, _volumeInUnits, Label, StopLossInPips, TakeProfitInPips);
            }
            else if (_williamsPctR.Result.Last(1) < -80 && _williamsPctR.Result.Last(2) > -80)
            {
                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 WilliamsPctRSample():
    def on_start(self):
        self.volumeInUnits = api.Symbol.QuantityToVolumeInUnits(api.VolumeInLots)
        self.williamsPctR = api.Indicators.WilliamsPctR(14)

    def on_bar_closed(self):
        if self.williamsPctR.Result.Last(0) > -20 and self.williamsPctR.Result.Last(1) < -20:
            self.close_positions(TradeType.Buy)
            api.ExecuteMarketOrder(TradeType.Sell, api.SymbolName, self.volumeInUnits, api.Label, api.StopLossInPips, api.TakeProfitInPips)
        elif self.williamsPctR.Result.Last(0) < -80 and self.williamsPctR.Result.Last(1) > -80:
            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 Williams PctR indicator calculation. [details](https://help.ctrader.com/ctrader-algo/references/Indicators/WilliamsPctR/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)