#region Namespaces
using System;
#endregion
namespace ScriptCode {
/// <summary>
/// Indicator scripts are used for calculating a series of numerical values.
///
/// This script can be used in several ways:
/// (1) It can be used on a chart.
/// (2) It can be used from another script.
/// (3) It can be used as a script column in a watchlist.
/// </summary>
public partial class MyIndicator : IndicatorScriptBase // NEVER CHANGE THE CLASS NAME
{
#region Variables
// The underlying indicator on which to calculate the indicator script.
private Indicator _indicator;
// The EMA indicator.
private Indicator _EMA;
// The number of periods to use in the moving average calculation.
private int _periods1;
// The number of periods to use in the linear regression calculation.
private int _periods2;
// The number of standard errors.
private int _stdErrors;
#endregion
#region OnInitialize
/// <summary>
/// This function accepts the user parameters for the script and is called when a new indicator instance is created.
/// One of the parameters accepted by it must be that of a symbol or another script that is
/// based on a symbol (drawing, indicator, pattern or signal). This symbol will be used as the underlying symbol for the indicator.
///
/// The parameter values can be specified from the user interface (UI) or from another script, depending on usage.
/// </summary>
/// --------------------------------------------------------------------------------------------------
/// PLEASE USE THE SCRIPT WIZARD (CTRL+W) TO ADD, EDIT AND REMOVE THE SCRIPT PARAMETERS
/// --------------------------------------------------------------------------------------------------
/// YOU MUST SET A PARAM TAG FOR EACH PARAMETER ACCEPTED BY THIS FUNCTION.
/// ALL PARAM TAGS SHOULD BE SET IN THE 'OnInitialize' REGION, RIGHT ABOVE THE 'OnInitialize' FUNCTION.
/// THE ORDER OF THE TAGS MUST MATCH THE ORDER OF THE ACTUAL PARAMETERS.
/// REQUIRED ATTRIBUTES:
/// (1) name: The exact parameter name.
/// (2) type: The type of data to collect from the user:
/// Set to "Integer" when the data type is 'int'
/// Set to "IntegerArray" when the data type is 'int[]'
/// Set to "DateTime" when the data type is 'long'
/// Set to "DateTimeArray" when the data type is 'long[]'
/// Set to "Boolean" when the data type is 'bool'
/// Set to "BooleanArray" when the data type is 'bool[]'
/// Set to "Double" when the data type is 'double'
/// Set to "DoubleArray" when the data type is 'double[]'
/// Set to "String" when the data type is 'string'
/// Set to "StringArray" when the data type is 'string[]'
/// Set to "Indicator" when the data type is 'Indicator'
/// Set to "Pattern" when the data type is 'Pattern'
/// Set to "Signal" when the data type is 'Signal'
/// Set to "Drawing" when the data type is 'Drawing'
/// Set to "Symbol" when the data type is 'int' representing a symbol index.
/// OPTIONAL ATTRIBUTES:
/// (3) default: The default parameter value is only valid when the type is Integer, Boolean, Double or String.
/// (4) min: The minimum parameter value is only valid when the type is Integer or Double.
/// (5) max: The maximum parameter value is only valid when the type is Integer or Double.
/// EXAMPLE: <param name="" type="" default="" min="" max="">Enter the parameter description here.</param>
/// --------------------------------------------------------------------------------------------------
/// <param name="indicator" type="Indicator">The underlying indicator on which to calculate the indicator script.</param>
/// <param name="periods1" type="Integer" default="10" min="1">The number of periods to use in the moving average calculation.</param>
/// <param name="periods2" type="Integer" default="20" min="1">The number of periods to use in the linear regression calculation.</param>
public void OnInitialize(
Indicator indicator,
int periods1,
int periods2) {
// Set the indicator.
_indicator = indicator;
// Set the number of periods for the moving average.
_periods1 = periods1;
// Set the number of periods for the LR.
_periods2 = periods2;
// Create the EMA indicator.
_EMA = IndicatorEMA(indicator, periods1);
}
#endregion
#region OnBarUpdate
/// <summary>
/// This function is used for calculating the indicator value for the latest bar (see the Indicator functions).
/// </summary>
/// <returns>The indicator value for the latest bar.</returns>
public override double OnBarUpdate() {
// The sum of X times Y, the sum of X, the sum of Y, the sum of X^2
double sumXY = 0;
double sumX = 0;
double sumY = 0;
double sumXPower = 0;
// The linear regression calculation.
double LR = 0;
// The average of the squared errors.
double averageError = 0;
// Calculate the linear regression and the average of the squared errors.
for (int i = _periods2 - 1; i >= 0; i--) {
sumXY = 0; sumX = 0; sumY = 0; sumXPower = 0;
for (int j = i + _periods2 - 1; j >= i; j--) {
sumXY += j * _indicator[j];
sumX += j;
sumY += _indicator[j];
sumXPower += j * j;
}
LR = (sumY - (1 * ((_periods2 * sumXY) - (sumX * sumY)) / (_periods2 * sumXPower - (sumX * sumX))) * sumX) / _periods2;
averageError += Math.Pow(_indicator[i] - LR, 2);
}
// Calculate the average error.
averageError = Math.Sqrt(averageError / _periods2);
// Calculate the lower band.
return _EMA[0] - averageError;
}
#endregion
#region OnChartSetup
/// <summary>
/// This function is used for setting up the indicator on the chart and registering its pens (see the IndicatorChartRegisterPenRGB function).
/// </summary>
public override void OnChartSetup() {
// Register a pen.
IndicatorChartRegisterPenRGB(0, "Pen", new int[] { 22 ,81, 238, 255 }, C_DashStyle.SOLID, 2);
}
#endregion
#region OnSelectPen
/// <summary>
/// This function is used for selecting a registered indicator pen with which to color the latest indicator value.
/// Call the IndicatorChartRegisterPenRGB function from the OnChartSetup function in order to register an indicator pen.
/// </summary>
/// <returns>The indicator pen index to use for coloring the latest indicator value.</returns>
public override byte OnSelectPen() {
// Color the indicator value with the zero pen.
return 0;
}
#endregion
}
}
