Candlestick Patterns

Ladder Bottom

Introduction

Create a new Ladder Bottom candlestick pattern indicator to indicate the pattern's presence.

Create Manual Indicators

A candlestick pattern indicator requires manual creation and update with a TradeBar object. Manual indicators let you update their values with any data you choose. The following reference table describes the LadderBottom constructor.

LadderBottom()1/2

            LadderBottom QuantConnect.Indicators.CandlestickPatterns.LadderBottom (
     string  name
   )
        

Initializes a new instance of the LadderBottom class using the specified name.

LadderBottom()2/2

            LadderBottom QuantConnect.Indicators.CandlestickPatterns.LadderBottom (
   )
        

Initializes a new instance of the LadderBottom class.

Update Manual Indicators

You can update the indicator automatically or manually.

Automatic Update

To register a manual indicator for automatic updates with the security data, call the RegisterIndicator method.

using QuantConnect.Indicators.CandlestickPatterns;

private LadderBottom _ladderbottom;

// In Initialize()
_ladderbottom = new LadderBottom(name);
_ladderbottom.Updated += IndicatorUpdateMethod;

RegisterIndicator(symbol, _ladderbottom, Resolution.Daily);

// In IndicatorUpdateMethod()
if (_ladderbottom.IsReady)
{
    var indicatorValue = _ladderbottom.Current.Value;
}
from QuantConnect.Indicators.CandlestickPatterns import LadderBottom
    
# In Initialize()
self.ladderbottom = LadderBottom(name)
self.ladderbottom.Updated += self.IndicatorUpdateMethod

self.RegisterIndicator(symbol, self.ladderbottom, Resolution.Daily)

# In IndicatorUpdateMethod()
if self.ladderbottom.IsReady:
    indicator_value = self.ladderbottom.Current.Value

To customize the data that automatically updates the indicator, see Custom Indicator Periods and Custom Indicator Values.

Manual Update

Updating your indicator manually enables you to control when the indicator is updated and what data you use to update it. To manually update the indicator, call the Update method with a TradeBar. The indicator will only be ready after you prime it with enough data.

using QuantConnect.Indicators.CandlestickPatterns;
    
private LadderBottom _ladderbottom;
private Symbol symbol;

// In Initialize()
_ladderbottom = new LadderBottom();
symbol = AddEquity("SPY").Symbol;

// In OnData()
if (data.Bars.ContainsKey(_symbol))
{
    _ladderbottom.Update(data.Bars[symbol]);
}
if (_ladderbottom.IsReady)
{
    var indicatorValue = _ladderbottom.Current.Value;
}
from QuantConnect.Indicators.CandlestickPatterns import LadderBottom
    
# In Initialize()
self.ladderbottom = LadderBottom()
self.symbol = self.AddEquity("SPY").Symbol

# In OnData()
if data.Bars.ContainsKey(self.symbol):
    self.ladderbottom.Update(data.Bars[self.symbol])
if self.ladderbottom.IsReady:
    indicator_value = self.ladderbottom.Current.Value

Get Indicator Values

To get the value of the indicator, use its Current.Value attribute.

private LadderBottom _ladderbottom;

// In Initialize()
var symbol = AddEquity("SPY").Symbol;
_ladderbottom = LadderBottom(symbol);

// In OnData()
if (_ladderbottom.IsReady)
{
    var current = _ladderbottom.Current.Value;
}
# In Initialize()
symbol = self.AddEquity("SPY").Symbol
self.ladderbottom = self.LadderBottom(symbol)

# In OnData()
if self.ladderbottom.IsReady:
    current = self.ladderbottom.Current.Value

Visualization

To plot indicator values, in the OnData event handler, call the Plot method.

private LadderBottom _ladderbottom;

// In Initialize()
var symbol = AddEquity("SPY").Symbol;
_ladderbottom = LadderBottom(symbol);

// In OnData()
if (_ladderbottom.IsReady)
{
    Plot("My Indicators", "ladderbottom", _ladderbottom.Current);
}
# In Initialize()
symbol = self.AddEquity("SPY").Symbol
self.ladderbottom = self.LadderBottom(symbol)

# In OnData()
if self.ladderbottom.IsReady:
    self.Plot("My Indicators", "ladderbottom", self.ladderbottom.Current)

The following image shows the plot values in a matplotlib plot. To load algorithm plot data into the Research Environment, see Charts.

For more information about plotting indicators, see Plotting Indicators.

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