ITsCalculationContext.CalculationType

Syntax

Description

The CalculationType property returns the custom method calculation mode.

Comments

If the pointwise calculation is used, that is, CalculationType = TsCalculationType.Pointwise, the custom method is executed for each series observation. If the series calculation is used, that is, CalculationType = TsCalculationType.Series, the method is executed for the entire series.

Example

This example displays a custom calculation method. To execute the example, add links to the Metabase, Ms, Transform system assemblies.

Public Function CalculateSomething: Variant;
Var
    pContext: ITsCalculationContext;
    i: Integer;
    pSeries: ITimeSeries;
Begin
    pContext := TsCalculation.Current;
    pContext.Tag := pContext.ParentObject.Name;
    pSeries := pContext.CreateTimeSeries;
    If pContext.CalculationType = TsCalculationType.Series Then
        pContext.RaiseMessage("Series mode");
        If pSeries.CalcPointCount < 25 Then
            If pSeries.CalcPointCount < 15 Then
                pContext.RaiseError("Number of observations is insufficient. Calculation cannot be executed");
            Else
                pContext.RaiseWarning("Number of observations is small. Unreliable data may be received");
            End If;
        End If;
        For i := pSeries.StartIndex To pSeries.EndIndex Do
            pSeries.Item(i) := 1 / i;
        End For;
        Return pSeries;
    Else
        If pContext.CalculationDirection = TsCalculationDirection.Forward Then
            pContext.RaiseMessage(Pointwise mode (forward));
        Else
            pContext.RaiseMessage(Pointwise mode (backward));
        End If;
        If pSeries.CalcPointCount < 25 Then
            If pSeries.CalcPointCount < 15 Then
                pContext.RaiseError("Number of observations is insufficient. Calculation cannot be executed");
            Else
                pContext.RaiseWarning("Number of observations is small. Unreliable data may be received");
            End If;
        End If;
        i := pSeries.CurrentIndex;
        pSeries.Item(i) := 1 / i;
        Return pSeries.Item(i);
    End If;
End Function CalculateSomething;

The method calculates values on the basis of observation index. The method works both in series and pointwise modes. The calculation mode is displayed in the message. If the number of observations is less than 25, the warning is displayed. If the number of observations is less than 15, the error is displayed and the method is not calculated.