Description

This subroutine modifies an existing Analysis Results Node by taking the 2D Fourier Transform of the data (axes and units are also properly transformed).  The grid data must be complex.  When working with non-complex data (ex. Irradiance) the ARNCreate2DComplexFromDouble routine can be used to quickly convert to an ARN which is suitable for a 2D FFT.  Data slicing from a 3D analysis results dataset can also be performed via the ARNCreate2DComplexFromComplex3D routine.

Syntax

ARNFFT2D arnNode

Parameters

arnNode As Long

Node number of the ARN whose data is being modified.  This ARN is modified in place (no copy is made).

Example

The following example creates several Analysis Results Nodes and manipulates their data by either taking a Log or performing an FFT.

Sub Main

    ARNDeleteAllNodes()

    DeleteRays()

    TraceCreate()

    Dim anaNode As Long

    anaNode = FindFullName( "Analysis Surface(s).DetectorAna" )

    Dim rayCnt As Long

    Dim arnNode As Long

    rayCnt = IrradianceToARN( anaNode, "Detector Irradiance", arnNode )

    'Log10 relative

    Dim newARN As Long

    newARN = ARNCreateCopy( arnNode, "Detector Irradiance Rel." )

    ARNLog10WithRelativeFloor( newARN, 2, False, True )

    ARNDisplayInChart( newARN, "" )

    'Log10 absolute

    newARN = ARNCreateCopy( arnNode, "Detector Irradiance Abs." )

    ARNLog10WithAbsoluteFloor( newARN, 66000, True, True )

    ARNDisplayInChart( newARN, "" )

    'FFT

    anaNode = FindFullName( "Analysis Surface(s).FFTAna" )

    IrradianceToARN( anaNode, "Detector Irradiance", arnNode )

    newARN = ARNCreate2DComplexFromDouble( arnNode )

    ARNFFT2D( newARN )

    ARNDisplayInChart( newARN, "" )

End Sub

See Also

ARN Script Commands