Supported Indicators

Rate Of Change Percent

Introduction

This indicator computes the n-period percentage rate of change in a value using the following: 100 * (value_0 - value_n) / value_n

To view the implementation of this indicator, see the LEAN GitHub repository.

Using ROCP Indicator

To create an automatic indicators for RateOfChangePercent, call the ROCP helper method from the QCAlgorithm class. The ROCP method creates a RateOfChangePercent object, hooks it up for automatic updates, and returns it so you can used it in your algorithm. In most cases, you should call the helper method in the Initializeinitialize method.

public class RateOfChangePercentAlgorithm : QCAlgorithm
{
    private Symbol _symbol;
    private RateOfChangePercent _rocp;

    public override void Initialize()
    {
        _symbol = AddEquity("SPY", Resolution.Daily).Symbol;
        _rocp = ROCP(_symbol, 10);
    }

    public override void OnData(Slice data)
    {
        if (_rocp.IsReady)
        {
            // The current value of _rocp is represented by itself (_rocp)
            // or _rocp.Current.Value
            Plot("RateOfChangePercent", "rocp", _rocp);
            
        }
    }
}
class RateOfChangePercentAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol
        self._rocp = self.rocp(self._symbol, 10)

    def on_data(self, slice: Slice) -> None:
        if self._rocp.is_ready:
            # The current value of self._rocp is represented by self._rocp.current.value
            self.plot("RateOfChangePercent", "rocp", self._rocp.current.value)
            

The following reference table describes the ROCP method:

rocp(symbol, period, resolution=None, selector=None)[source]

Creates a new RateOfChangePercent indicator. This will compute the n-period percentage rate of change in the security. The indicator will be automatically updated on the given resolution.

Parameters:
  • symbol (Symbol) — The symbol whose RateOfChangePercent we want
  • period (int) — The period over which to compute the RateOfChangePercent
  • resolution (Resolution, optional) — The resolution
  • selector (Callable[IBaseData, float], optional) — x.Value)
Returns:

The RateOfChangePercent indicator for the requested symbol over the specified period

Return type:

RateOfChangePercent

ROCP(symbol, period, resolution=None, selector=None)[source]

Creates a new RateOfChangePercent indicator. This will compute the n-period percentage rate of change in the security. The indicator will be automatically updated on the given resolution.

Parameters:
  • symbol (Symbol) — The symbol whose RateOfChangePercent we want
  • period (Int32) — The period over which to compute the RateOfChangePercent
  • resolution (Resolution, optional) — The resolution
  • selector (Func<IBaseData, Decimal>, optional) — x.Value)
Returns:

The RateOfChangePercent indicator for the requested symbol over the specified period

Return type:

RateOfChangePercent

If you don't provide a resolution, it defaults to the security resolution. If you provide a resolution, it must be greater than or equal to the resolution of the security. For instance, if you subscribe to hourly data for a security, you should update its indicator with data that spans 1 hour or longer.

For more information about the selector argument, see Alternative Price Fields.

For more information about plotting indicators, see Plotting Indicators.

You can manually create a RateOfChangePercent indicator, so it doesn't automatically update. Manual indicators let you update their values with any data you choose.

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 Updateupdate method with time/number pair or an IndicatorDataPoint. The indicator will only be ready after you prime it with enough data.

public class RateOfChangePercentAlgorithm : QCAlgorithm
{
    private Symbol _symbol;
    private RateOfChangePercent _rocp;

    public override void Initialize()
    {
        _symbol = AddEquity("SPY", Resolution.Daily).Symbol;
        _rocp = new RateOfChangePercent(10);
    }

    public override void OnData(Slice data)
    {
        if (data.Bars.TryGetValue(_symbol, out var bar))
        {      
            _rocp.Update(bar.EndTime, bar.Close);
        }
   
        if (_rocp.IsReady)
        {
            // The current value of _rocp is represented by itself (_rocp)
            // or _rocp.Current.Value
            Plot("RateOfChangePercent", "rocp", _rocp);
            
        }
    }
}
class RateOfChangePercentAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol
        self._rocp = RateOfChangePercent(10)

    def on_data(self, slice: Slice) -> None:
        bar = slice.bars.get(self._symbol)
        if bar:
            self._rocp.update(bar.EndTime, bar.Close)
        if self._rocp.is_ready:
            # The current value of self._rocp is represented by self._rocp.current.value
            self.plot("RateOfChangePercent", "rocp", self._rocp.current.value)
            

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

public class RateOfChangePercentAlgorithm : QCAlgorithm
{
    private Symbol _symbol;
    private RateOfChangePercent _rocp;

    public override void Initialize()
    {
        _symbol = AddEquity("SPY", Resolution.Daily).Symbol;
        _rocp = new RateOfChangePercent(10);
        RegisterIndicator(_symbol, _rocp, Resolution.Daily);
    }

    public override void OnData(Slice data)
    {
        if (_rocp.IsReady)
        {
            // The current value of _rocp is represented by itself (_rocp)
            // or _rocp.Current.Value
            Plot("RateOfChangePercent", "rocp", _rocp);
            
        }
    }
}
class RateOfChangePercentAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol
        self._rocp = RateOfChangePercent(10)
        self.register_indicator(self._symbol, self._rocp, Resolution.DAILY)

    def on_data(self, slice: Slice) -> None:
        if self._rocp.is_ready:
            # The current value of self._rocp is represented by self._rocp.current.value
            self.plot("RateOfChangePercent", "rocp", self._rocp.current.value)
            

The following reference table describes the RateOfChangePercent constructor:

RateOfChangePercent

class QuantConnect.Indicators.RateOfChangePercent[source]

This indicator computes the n-period percentage rate of change in a value using the following: 100 * (value_0 - value_n) / value_n

get_enumerator()

Returns an enumerator that iterates through the history window.

Return type:

IEnumerator[IndicatorDataPoint]

reset()

Resets this indicator to its initial state

to_detailed_string()

Provides a more detailed string of this indicator in the form of {Name} - {Value}

Return type:

str

update(time, value)

Updates the state of this indicator with the given value and returns true if this indicator is ready, false otherwise

Parameters:
  • time (datetime)
  • value (float)
Return type:

bool

update(input)

Updates the state of this indicator with the given value and returns true if this indicator is ready, false otherwise

Parameters:
  • input (IBaseData)
Return type:

bool

property consolidators

The data consolidators associated with this indicator if any

Returns:

The data consolidators associated with this indicator if any

Return type:

ISet[IDataConsolidator]

property current

Gets the current state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.

Returns:

Gets the current state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.

Return type:

IndicatorDataPoint

property is_ready

Gets a flag indicating when this indicator is ready and fully initialized.

Returns:

Gets a flag indicating when this indicator is ready and fully initialized.

Return type:

bool

property item

Indexes the history windows, where index 0 is the most recent indicator value. If index is greater or equal than the current count, it returns null. If the index is greater or equal than the window size, it returns null and resizes the windows to i + 1.

Returns:

Indexes the history windows, where index 0 is the most recent indicator value. If index is greater or equal than the current count, it returns null. If the index is greater or equal than the window size, it returns null and resizes the windows to i + 1.

Return type:

IndicatorDataPoint

property name

Gets a name for this indicator

Returns:

Gets a name for this indicator

Return type:

str

property period

Gets the period of this window indicator

Returns:

Gets the period of this window indicator

Return type:

int

property previous

Gets the previous state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.

Returns:

Gets the previous state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.

Return type:

IndicatorDataPoint

property samples

Gets the number of samples processed by this indicator

Returns:

Gets the number of samples processed by this indicator

Return type:

int

property warm_up_period

Required period, in data points, for the indicator to be ready and fully initialized. Our formula is Period + 1 because we need to fill the window and have one removed before it is ready.

Returns:

Required period, in data points, for the indicator to be ready and fully initialized. Our formula is Period + 1 because we need to fill the window and have one removed before it is ready.

Return type:

int

property window

A rolling window keeping a history of the indicator values of a given period

Returns:

A rolling window keeping a history of the indicator values of a given period

Return type:

RollingWindow[IndicatorDataPoint]

RateOfChangePercent

class QuantConnect.Indicators.RateOfChangePercent[source]

This indicator computes the n-period percentage rate of change in a value using the following: 100 * (value_0 - value_n) / value_n

GetEnumerator()

Returns an enumerator that iterates through the history window.

Return type:

IEnumerator[IndicatorDataPoint]

Reset()

Resets this indicator to its initial state

ToDetailedString()

Provides a more detailed string of this indicator in the form of {Name} - {Value}

Return type:

String

Update(time, value)

Updates the state of this indicator with the given value and returns true if this indicator is ready, false otherwise

Parameters:
  • time (DateTime)
  • value (decimal)
Return type:

Boolean

Update(input)

Updates the state of this indicator with the given value and returns true if this indicator is ready, false otherwise

Parameters:
  • input (IBaseData)
Return type:

Boolean

property Consolidators

The data consolidators associated with this indicator if any

Returns:

The data consolidators associated with this indicator if any

Return type:

ISet<IDataConsolidator>

property Current

Gets the current state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.

Returns:

Gets the current state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.

Return type:

IndicatorDataPoint

property IsReady

Gets a flag indicating when this indicator is ready and fully initialized.

Returns:

Gets a flag indicating when this indicator is ready and fully initialized.

Return type:

bool

property Name

Gets a name for this indicator

Returns:

Gets a name for this indicator

Return type:

string

property Period

Gets the period of this window indicator

Returns:

Gets the period of this window indicator

Return type:

Int32

property Previous

Gets the previous state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.

Returns:

Gets the previous state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.

Return type:

IndicatorDataPoint

property Samples

Gets the number of samples processed by this indicator

Returns:

Gets the number of samples processed by this indicator

Return type:

int

property WarmUpPeriod

Required period, in data points, for the indicator to be ready and fully initialized. Our formula is Period + 1 because we need to fill the window and have one removed before it is ready.

Returns:

Required period, in data points, for the indicator to be ready and fully initialized. Our formula is Period + 1 because we need to fill the window and have one removed before it is ready.

Return type:

Int32

property Window

A rolling window keeping a history of the indicator values of a given period

Returns:

A rolling window keeping a history of the indicator values of a given period

Return type:

RollingWindow<IndicatorDataPoint>

property [System.Int32]

Indexes the history windows, where index 0 is the most recent indicator value. If index is greater or equal than the current count, it returns null. If the index is greater or equal than the window size, it returns null and resizes the windows to i + 1.

Returns:

Indexes the history windows, where index 0 is the most recent indicator value. If index is greater or equal than the current count, it returns null. If the index is greater or equal than the window size, it returns null and resizes the windows to i + 1.

Return type:

IndicatorDataPoint

Visualization

The following image shows plot values of selected properties of RateOfChangePercent using the plotly library.

RateOfChangePercent line plot.

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