SPADistribution.Defined (property, read-only)

Description

Returns whether the distribution is defined for the specified x-value.

To obtain the actual x-values range, you can use the SPADistribution.Statistics property (see the note below).

Syntax

Arguments

Name	Type	Description
x	Double	The x-value

Return Value

(Boolean) - whether the distribution is defined.

Example

Sub Test()
  Dim dist As New SPADistribution
  Dim x, y As Double

  SPAApplication.Initialize

  ' specify the distribution type and parameters
  dist.Type = SPADistWeibull  ' Weibull distribution 
  dist.Param(0) = 1.5         ' alpha
  dist.Param(1) = 2           ' beta

  x = 1

  ' check if the x-value is valid
  If dist.Defined(x) Then
    y = dist.Pdf(x)
  Else
    MsgBox "The distribution is not defined for this x-value"
  End If
End Sub
  

How to Obtain the X-Values Range

To obtain the actual x-values range, you can use the SPADistribution.Statistics property:

Sub Range()
  Dim dist As New SPADistribution
  Dim min, max As String
  
  SPAApplication.Initialize
  dist.Type = SPADistGamma
  
  If dist.Statistics.Defined(SPAStatMin) Then
    min = dist.Statistics.Value(SPAStatMin)
  Else
    min = "-Infinity"
  End If
    
  If dist.Statistics.Defined(SPAStatMax) Then
    max = dist.Statistics.Value(SPAStatMax)
  Else
    max = "+Infinity"
  End If

  MsgBox "min=" & min & "; max=" & max
End Sub