Public Types | Static Public Member Functions | List of all members
fft Class Reference

Fast fourier transform derived from the Numerical Recipes in C routine. More...

Public Types

enum  transformDirection { FORWARD_TRANSFORM = 1, REVERSE_TRANSFORM = -1 }
 

Static Public Member Functions

static void transform (complexField &field, const labelList &nn, transformDirection fftDirection)
 
static tmp< complexField > forwardTransform (const tmp< complexField > &field, const labelList &nn)
 
static tmp< complexField > reverseTransform (const tmp< complexField > &field, const labelList &nn)
 
static tmp< complexVectorField > forwardTransform (const tmp< complexVectorField > &field, const labelList &nn)
 
static tmp< complexVectorField > reverseTransform (const tmp< complexVectorField > &field, const labelList &nn)
 

Detailed Description

Fast fourier transform derived from the Numerical Recipes in C routine.

The complex transform field is returned in the field supplied. The direction of transform is supplied as an argument (1 = forward, -1 = reverse). The dimensionality and organisation of the array of values in space is supplied in the nn indexing array.

Source files

Definition at line 51 of file fft.H.

Member Enumeration Documentation

enum transformDirection
Enumerator
FORWARD_TRANSFORM 
REVERSE_TRANSFORM 

Definition at line 56 of file fft.H.

Member Function Documentation

void transform ( complexField &  field,
const labelList &  nn,
transformDirection  fftDirection 
)
static

Definition at line 42 of file fft.C.

References Foam::abort(), UList< T >::begin(), Foam::endl(), Foam::FatalError, FatalErrorInFunction, Foam::fftRenumber(), forAll, fft::forwardTransform(), n, Foam::sin(), List< T >::size(), Foam::sqrt(), SWAP, and TWOPI.

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tmp< complexField > forwardTransform ( const tmp< complexField > &  field,
const labelList &  nn 
)
static

Definition at line 187 of file fft.C.

References tmp< T >::clear(), tmp< T >::ref(), fft::reverseTransform(), and Foam::transform().

Referenced by Foam::calcEk(), fft::reverseTransform(), and fft::transform().

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tmp< complexField > reverseTransform ( const tmp< complexField > &  field,
const labelList &  nn 
)
static

Definition at line 203 of file fft.C.

References tmp< T >::clear(), fft::forwardTransform(), tmp< T >::ref(), and Foam::transform().

Referenced by fft::forwardTransform(), noiseFFT::Pf(), and turbGen::U().

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tmp< complexVectorField > forwardTransform ( const tmp< complexVectorField > &  field,
const labelList &  nn 
)
static

Definition at line 219 of file fft.C.

References tmp< T >::clear(), Foam::component(), VectorSpace< Vector< scalar >, scalar, 3 >::nComponents, tmp< T >::ref(), Field< Type >::replace(), and fft::reverseTransform().

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tmp< complexVectorField > reverseTransform ( const tmp< complexVectorField > &  field,
const labelList &  nn 
)
static

Definition at line 248 of file fft.C.

References tmp< T >::clear(), Foam::component(), VectorSpace< Vector< scalar >, scalar, 3 >::nComponents, tmp< T >::ref(), and Field< Type >::replace().

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The documentation for this class was generated from the following files:
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