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Reference Guide
TFFTComplexReal Class Reference

One of the interface classes to the FFTW package, can be used directly or via the TVirtualFFT class.

Only the basic interface of FFTW is implemented.

Computes the inverse of the real-to-complex transforms (class TFFTRealComplex) taking complex input (storing the non-redundant half of a logically Hermitian array) to real output (see FFTW manual for more details)

How to use it:

  1. Create an instance of TFFTComplexReal - this will allocate input and output arrays (unless an in-place transform is specified)
  2. Run the Init() function with the desired flags and settings
  3. Set the data (via SetPoints(), SetPoint() or SetPointComplex() functions)
  4. Run the Transform() function
  5. Get the output (via GetPoints(), GetPoint() or GetPointReal() functions)
  6. Repeat steps 3)-5) as needed

For a transform of the same size, but with different flags, rerun the Init() function and continue with steps 3)-5)

NOTE:

  1. running Init() function will overwrite the input array! Don't set any data before running the Init() function
  2. FFTW computes unnormalized transform, so doing a transform followed by its inverse will lead to the original array scaled by the transform size
  3. In Complex to Real transform the input array is destroyed. It cannot then be retrieved when using the Get's methods.

Definition at line 21 of file TFFTComplexReal.h.

Public Member Functions

 TFFTComplexReal ()
 default More...
 
 TFFTComplexReal (Int_t n, Bool_t inPlace)
 For 1d transforms Allocates memory for the input array, and, if inPlace = kFALSE, for the output array. More...
 
 TFFTComplexReal (Int_t ndim, Int_t *n, Bool_t inPlace)
 For ndim-dimensional transforms Second argument contains sizes of the transform in each dimension. More...
 
 ~TFFTComplexReal () override
 Destroys the data arrays and the plan. More...
 
Int_tGetN () const override
 
Int_t GetNdim () const override
 
void GetPointComplex (const Int_t *ipoint, Double_t &re, Double_t &im, Bool_t fromInput=kFALSE) const override
 For multidimensional transforms. More...
 
void GetPointComplex (Int_t ipoint, Double_t &re, Double_t &im, Bool_t fromInput=kFALSE) const override
 Works only for output (input array is destroyed in a C2R transform) More...
 
Double_t GetPointReal (const Int_t *ipoint, Bool_t fromInput=kFALSE) const override
 For multidimensional transforms. More...
 
Double_t GetPointReal (Int_t ipoint, Bool_t fromInput=kFALSE) const override
 Returns the point #ipoint Works only for output (input array is destroyed in a C2R transform) More...
 
void GetPoints (Double_t *data, Bool_t fromInput=kFALSE) const override
 Fills the argument array with the computed transform Works only for output (input array is destroyed in a C2R transform) More...
 
void GetPointsComplex (Double_t *data, Bool_t fromInput=kFALSE) const override
 Fills the argument array with the computed transform. More...
 
void GetPointsComplex (Double_t *re, Double_t *im, Bool_t fromInput=kFALSE) const override
 Fills the argument array with the computed transform Works only for output (input array is destroyed in a C2R transform) More...
 
Double_tGetPointsReal (Bool_t fromInput=kFALSE) const override
 Returns the array of computed transform Works only for output (input array is destroyed in a C2R transform) More...
 
Int_t GetSign () const override
 
virtual Int_t GetSize () const
 
Option_tGetTransformFlag () const override
 
Option_tGetType () const override
 
void Init (Option_t *flags, Int_t, const Int_t *) override
 Creates the fftw-plan. More...
 
TClassIsA () const override
 
Bool_t IsInplace () const override
 
void SetPoint (const Int_t *ipoint, Double_t re, Double_t im=0) override
 Set the point #ipoint. More...
 
void SetPoint (Int_t ipoint, Double_t re, Double_t im=0) override
 since the input must be complex-Hermitian, if the ipoint > n/2, the according point before n/2 is set to (re, -im) More...
 
void SetPointComplex (Int_t ipoint, TComplex &c) override
 since the input must be complex-Hermitian, if the ipoint > n/2, the according point before n/2 is set to (re, -im) More...
 
void SetPoints (const Double_t *data) override
 set all points. More...
 
void SetPointsComplex (const Double_t *re, const Double_t *im) override
 Set all points. The values are copied. More...
 
void Streamer (TBuffer &) override
 Stream an object of class TObject. More...
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
void Transform () override
 Computes the transform, specified in Init() function. More...
 
- Public Member Functions inherited from TVirtualFFT
 TVirtualFFT ()
 
virtual ~TVirtualFFT ()
 destructor More...
 
virtual Int_tGetN () const =0
 
virtual Int_t GetNdim () const =0
 
virtual void GetPointComplex (const Int_t *ipoint, Double_t &re, Double_t &im, Bool_t fromInput=kFALSE) const =0
 
virtual void GetPointComplex (Int_t ipoint, Double_t &re, Double_t &im, Bool_t fromInput=kFALSE) const =0
 
virtual Double_t GetPointReal (const Int_t *ipoint, Bool_t fromInput=kFALSE) const =0
 
virtual Double_t GetPointReal (Int_t ipoint, Bool_t fromInput=kFALSE) const =0
 
virtual void GetPoints (Double_t *data, Bool_t fromInput=kFALSE) const =0
 
virtual void GetPointsComplex (Double_t *data, Bool_t fromInput=kFALSE) const =0
 
virtual void GetPointsComplex (Double_t *re, Double_t *im, Bool_t fromInput=kFALSE) const =0
 
virtual Double_tGetPointsReal (Bool_t fromInput=kFALSE) const =0
 
virtual Int_t GetSign () const =0
 
virtual Option_tGetTransformFlag () const =0
 
virtual Option_tGetType () const =0
 
virtual void Init (Option_t *flag, Int_t sign, const Int_t *kind)=0
 
TClassIsA () const override
 
virtual Bool_t IsInplace () const =0
 
virtual void SetPoint (const Int_t *ipoint, Double_t re, Double_t im=0)=0
 
virtual void SetPoint (Int_t ipoint, Double_t re, Double_t im=0)=0
 
virtual void SetPointComplex (Int_t ipoint, TComplex &c)=0
 
virtual void SetPoints (const Double_t *data)=0
 
virtual void SetPointsComplex (const Double_t *re, const Double_t *im)=0
 
void Streamer (TBuffer &) override
 Stream an object of class TObject. More...
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
virtual void Transform ()=0
 
- Public Member Functions inherited from TObject
 TObject ()
 TObject constructor. More...
 
 TObject (const TObject &object)
 TObject copy ctor. More...
 
virtual ~TObject ()
 TObject destructor. More...
 
void AbstractMethod (const char *method) const
 Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...
 
virtual void AppendPad (Option_t *option="")
 Append graphics object to current pad. More...
 
virtual void Browse (TBrowser *b)
 Browse object. May be overridden for another default action. More...
 
ULong_t CheckedHash ()
 Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object. More...
 
virtual const char * ClassName () const
 Returns name of class to which the object belongs. More...
 
virtual void Clear (Option_t *="")
 
virtual TObjectClone (const char *newname="") const
 Make a clone of an object using the Streamer facility. More...
 
virtual Int_t Compare (const TObject *obj) const
 Compare abstract method. More...
 
virtual void Copy (TObject &object) const
 Copy this to obj. More...
 
virtual void Delete (Option_t *option="")
 Delete this object. More...
 
virtual Int_t DistancetoPrimitive (Int_t px, Int_t py)
 Computes distance from point (px,py) to the object. More...
 
virtual void Draw (Option_t *option="")
 Default Draw method for all objects. More...
 
virtual void DrawClass () const
 Draw class inheritance tree of the class to which this object belongs. More...
 
virtual TObjectDrawClone (Option_t *option="") const
 Draw a clone of this object in the current selected pad for instance with: gROOT->SetSelectedPad(gPad). More...
 
virtual void Dump () const
 Dump contents of object on stdout. More...
 
virtual void Error (const char *method, const char *msgfmt,...) const
 Issue error message. More...
 
virtual void Execute (const char *method, const char *params, Int_t *error=0)
 Execute method on this object with the given parameter string, e.g. More...
 
virtual void Execute (TMethod *method, TObjArray *params, Int_t *error=0)
 Execute method on this object with parameters stored in the TObjArray. More...
 
virtual void ExecuteEvent (Int_t event, Int_t px, Int_t py)
 Execute action corresponding to an event at (px,py). More...
 
virtual void Fatal (const char *method, const char *msgfmt,...) const
 Issue fatal error message. More...
 
virtual TObjectFindObject (const char *name) const
 Must be redefined in derived classes. More...
 
virtual TObjectFindObject (const TObject *obj) const
 Must be redefined in derived classes. More...
 
virtual Option_tGetDrawOption () const
 Get option used by the graphics system to draw this object. More...
 
virtual const char * GetIconName () const
 Returns mime type name of object. More...
 
virtual const char * GetName () const
 Returns name of object. More...
 
virtual char * GetObjectInfo (Int_t px, Int_t py) const
 Returns string containing info about the object at position (px,py). More...
 
virtual Option_tGetOption () const
 
virtual const char * GetTitle () const
 Returns title of object. More...
 
virtual UInt_t GetUniqueID () const
 Return the unique object id. More...
 
virtual Bool_t HandleTimer (TTimer *timer)
 Execute action in response of a timer timing out. More...
 
virtual ULong_t Hash () const
 Return hash value for this object. More...
 
Bool_t HasInconsistentHash () const
 Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e. More...
 
virtual void Info (const char *method, const char *msgfmt,...) const
 Issue info message. More...
 
virtual Bool_t InheritsFrom (const char *classname) const
 Returns kTRUE if object inherits from class "classname". More...
 
virtual Bool_t InheritsFrom (const TClass *cl) const
 Returns kTRUE if object inherits from TClass cl. More...
 
virtual void Inspect () const
 Dump contents of this object in a graphics canvas. More...
 
void InvertBit (UInt_t f)
 
virtual TClassIsA () const
 
virtual Bool_t IsEqual (const TObject *obj) const
 Default equal comparison (objects are equal if they have the same address in memory). More...
 
virtual Bool_t IsFolder () const
 Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
 
R__ALWAYS_INLINE Bool_t IsOnHeap () const
 
virtual Bool_t IsSortable () const
 
R__ALWAYS_INLINE Bool_t IsZombie () const
 
virtual void ls (Option_t *option="") const
 The ls function lists the contents of a class on stdout. More...
 
void MayNotUse (const char *method) const
 Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...
 
virtual Bool_t Notify ()
 This method must be overridden to handle object notification. More...
 
void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
 Use this method to declare a method obsolete. More...
 
void operator delete (void *ptr)
 Operator delete. More...
 
void operator delete[] (void *ptr)
 Operator delete []. More...
 
void * operator new (size_t sz)
 
void * operator new (size_t sz, void *vp)
 
void * operator new[] (size_t sz)
 
void * operator new[] (size_t sz, void *vp)
 
TObjectoperator= (const TObject &rhs)
 TObject assignment operator. More...
 
virtual void Paint (Option_t *option="")
 This method must be overridden if a class wants to paint itself. More...
 
virtual void Pop ()
 Pop on object drawn in a pad to the top of the display list. More...
 
virtual void Print (Option_t *option="") const
 This method must be overridden when a class wants to print itself. More...
 
virtual Int_t Read (const char *name)
 Read contents of object with specified name from the current directory. More...
 
virtual void RecursiveRemove (TObject *obj)
 Recursively remove this object from a list. More...
 
void ResetBit (UInt_t f)
 
virtual void SaveAs (const char *filename="", Option_t *option="") const
 Save this object in the file specified by filename. More...
 
virtual void SavePrimitive (std::ostream &out, Option_t *option="")
 Save a primitive as a C++ statement(s) on output stream "out". More...
 
void SetBit (UInt_t f)
 
void SetBit (UInt_t f, Bool_t set)
 Set or unset the user status bits as specified in f. More...
 
virtual void SetDrawOption (Option_t *option="")
 Set drawing option for object. More...
 
virtual void SetUniqueID (UInt_t uid)
 Set the unique object id. More...
 
virtual void Streamer (TBuffer &)
 Stream an object of class TObject. More...
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
virtual void SysError (const char *method, const char *msgfmt,...) const
 Issue system error message. More...
 
R__ALWAYS_INLINE Bool_t TestBit (UInt_t f) const
 
Int_t TestBits (UInt_t f) const
 
virtual void UseCurrentStyle ()
 Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...
 
virtual void Warning (const char *method, const char *msgfmt,...) const
 Issue warning message. More...
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
 Write this object to the current directory. More...
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
 Write this object to the current directory. More...
 

Static Public Member Functions

static TClassClass ()
 
static const char * Class_Name ()
 
static Version_t Class_Version ()
 
static const char * DeclFileName ()
 
- Static Public Member Functions inherited from TVirtualFFT
static TClassClass ()
 
static const char * Class_Name ()
 
static Version_t Class_Version ()
 
static const char * DeclFileName ()
 
static TVirtualFFTFFT (Int_t ndim, Int_t *n, Option_t *option)
 Returns a pointer to the FFT of requested size and type. More...
 
static TVirtualFFTGetCurrentTransform ()
 static: return current fgFFT More...
 
static const char * GetDefaultFFT ()
 static: return the name of the default fft More...
 
static void SetDefaultFFT (const char *name="")
 static: set name of default fft More...
 
static void SetTransform (TVirtualFFT *fft)
 static: set the current transfrom to parameter More...
 
static TVirtualFFTSineCosine (Int_t ndim, Int_t *n, Int_t *r2rkind, Option_t *option)
 Returns a pointer to a sine or cosine transform of requested size and kind. More...
 
- Static Public Member Functions inherited from TObject
static TClassClass ()
 
static const char * Class_Name ()
 
static Version_t Class_Version ()
 
static const char * DeclFileName ()
 
static Longptr_t GetDtorOnly ()
 Return destructor only flag. More...
 
static Bool_t GetObjectStat ()
 Get status of object stat flag. More...
 
static void SetDtorOnly (void *obj)
 Set destructor only flag. More...
 
static void SetObjectStat (Bool_t stat)
 Turn on/off tracking of objects in the TObjectTable. More...
 

Protected Member Functions

UInt_t MapFlag (Option_t *flag)
 allowed options: "ES" - FFTW_ESTIMATE "M" - FFTW_MEASURE "P" - FFTW_PATIENT "EX" - FFTW_EXHAUSTIVE More...
 
- Protected Member Functions inherited from TObject
virtual void DoError (int level, const char *location, const char *fmt, va_list va) const
 Interface to ErrorHandler (protected). More...
 
void MakeZombie ()
 

Protected Attributes

TString fFlags
 
void * fIn
 
Int_tfN
 
Int_t fNdim
 
void * fOut
 
void * fPlan
 
Int_t fTotalSize
 

Additional Inherited Members

- Public Types inherited from TObject
enum  {
  kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 ,
  kBitMask = 0x00ffffff
}
 
enum  { kSingleKey = (1ULL << ( 0 )) , kOverwrite = (1ULL << ( 1 )) , kWriteDelete = (1ULL << ( 2 )) }
 
enum  EDeprecatedStatusBits { kObjInCanvas = (1ULL << ( 3 )) }
 
enum  EStatusBits {
  kCanDelete = (1ULL << ( 0 )) , kMustCleanup = (1ULL << ( 3 )) , kIsReferenced = (1ULL << ( 4 )) , kHasUUID = (1ULL << ( 5 )) ,
  kCannotPick = (1ULL << ( 6 )) , kNoContextMenu = (1ULL << ( 8 )) , kInvalidObject = (1ULL << ( 13 ))
}
 
- Protected Types inherited from TObject
enum  { kOnlyPrepStep = (1ULL << ( 3 )) }
 
- Static Protected Attributes inherited from TVirtualFFT
static TString fgDefault = ""
 
static TVirtualFFTfgFFT = nullptr
 

#include <TFFTComplexReal.h>

Inheritance diagram for TFFTComplexReal:
[legend]

Constructor & Destructor Documentation

◆ TFFTComplexReal() [1/3]

TFFTComplexReal::TFFTComplexReal ( )

default

Definition at line 54 of file TFFTComplexReal.cxx.

◆ TFFTComplexReal() [2/3]

TFFTComplexReal::TFFTComplexReal ( Int_t  n,
Bool_t  inPlace 
)

For 1d transforms Allocates memory for the input array, and, if inPlace = kFALSE, for the output array.

Definition at line 68 of file TFFTComplexReal.cxx.

◆ TFFTComplexReal() [3/3]

TFFTComplexReal::TFFTComplexReal ( Int_t  ndim,
Int_t n,
Bool_t  inPlace 
)

For ndim-dimensional transforms Second argument contains sizes of the transform in each dimension.

Definition at line 89 of file TFFTComplexReal.cxx.

◆ ~TFFTComplexReal()

TFFTComplexReal::~TFFTComplexReal ( )
override

Destroys the data arrays and the plan.

However, some plan information stays around until the root session is over, and is reused if other plans of the same size are created

Definition at line 115 of file TFFTComplexReal.cxx.

Member Function Documentation

◆ Class()

static TClass * TFFTComplexReal::Class ( )
static
Returns
TClass describing this class

◆ Class_Name()

static const char * TFFTComplexReal::Class_Name ( )
static
Returns
Name of this class

◆ Class_Version()

static Version_t TFFTComplexReal::Class_Version ( )
inlinestatic
Returns
Version of this class

Definition at line 66 of file TFFTComplexReal.h.

◆ DeclFileName()

static const char * TFFTComplexReal::DeclFileName ( )
inlinestatic
Returns
Name of the file containing the class declaration

Definition at line 66 of file TFFTComplexReal.h.

◆ GetN()

Int_t * TFFTComplexReal::GetN ( ) const
inlineoverridevirtual

Implements TVirtualFFT.

Definition at line 43 of file TFFTComplexReal.h.

◆ GetNdim()

Int_t TFFTComplexReal::GetNdim ( ) const
inlineoverridevirtual

Implements TVirtualFFT.

Definition at line 44 of file TFFTComplexReal.h.

◆ GetPointComplex() [1/2]

void TFFTComplexReal::GetPointComplex ( const Int_t ipoint,
Double_t re,
Double_t im,
Bool_t  fromInput = kFALSE 
) const
overridevirtual

For multidimensional transforms.

Returns the point #ipoint Works only for output (input array is destroyed in a C2R transform)

Implements TVirtualFFT.

Definition at line 240 of file TFFTComplexReal.cxx.

◆ GetPointComplex() [2/2]

void TFFTComplexReal::GetPointComplex ( Int_t  ipoint,
Double_t re,
Double_t im,
Bool_t  fromInput = kFALSE 
) const
overridevirtual

Works only for output (input array is destroyed in a C2R transform)

Implements TVirtualFFT.

Definition at line 225 of file TFFTComplexReal.cxx.

◆ GetPointReal() [1/2]

Double_t TFFTComplexReal::GetPointReal ( const Int_t ipoint,
Bool_t  fromInput = kFALSE 
) const
overridevirtual

For multidimensional transforms.

Returns the point #ipoint Works only for output (input array is destroyed in a C2R transform)

Implements TVirtualFFT.

Definition at line 207 of file TFFTComplexReal.cxx.

◆ GetPointReal() [2/2]

Double_t TFFTComplexReal::GetPointReal ( Int_t  ipoint,
Bool_t  fromInput = kFALSE 
) const
overridevirtual

Returns the point #ipoint Works only for output (input array is destroyed in a C2R transform)

Implements TVirtualFFT.

Definition at line 193 of file TFFTComplexReal.cxx.

◆ GetPoints()

void TFFTComplexReal::GetPoints ( Double_t data,
Bool_t  fromInput = kFALSE 
) const
overridevirtual

Fills the argument array with the computed transform Works only for output (input array is destroyed in a C2R transform)

Implements TVirtualFFT.

Definition at line 179 of file TFFTComplexReal.cxx.

◆ GetPointsComplex() [1/2]

void TFFTComplexReal::GetPointsComplex ( Double_t data,
Bool_t  fromInput = kFALSE 
) const
overridevirtual

Fills the argument array with the computed transform.

Works only for output (input array is destroyed in a C2R transform)

Implements TVirtualFFT.

Definition at line 293 of file TFFTComplexReal.cxx.

◆ GetPointsComplex() [2/2]

void TFFTComplexReal::GetPointsComplex ( Double_t re,
Double_t im,
Bool_t  fromInput = kFALSE 
) const
overridevirtual

Fills the argument array with the computed transform Works only for output (input array is destroyed in a C2R transform)

Implements TVirtualFFT.

Definition at line 276 of file TFFTComplexReal.cxx.

◆ GetPointsReal()

Double_t * TFFTComplexReal::GetPointsReal ( Bool_t  fromInput = kFALSE) const
overridevirtual

Returns the array of computed transform Works only for output (input array is destroyed in a C2R transform)

Implements TVirtualFFT.

Definition at line 259 of file TFFTComplexReal.cxx.

◆ GetSign()

Int_t TFFTComplexReal::GetSign ( ) const
inlineoverridevirtual

Implements TVirtualFFT.

Definition at line 46 of file TFFTComplexReal.h.

◆ GetSize()

virtual Int_t TFFTComplexReal::GetSize ( ) const
inlinevirtual

Definition at line 42 of file TFFTComplexReal.h.

◆ GetTransformFlag()

Option_t * TFFTComplexReal::GetTransformFlag ( ) const
inlineoverridevirtual

Implements TVirtualFFT.

Definition at line 47 of file TFFTComplexReal.h.

◆ GetType()

Option_t * TFFTComplexReal::GetType ( ) const
inlineoverridevirtual

Implements TVirtualFFT.

Definition at line 45 of file TFFTComplexReal.h.

◆ Init()

void TFFTComplexReal::Init ( Option_t flags,
Int_t  ,
const Int_t  
)
overridevirtual

Creates the fftw-plan.

NOTE: input and output arrays are overwritten during initialisation, so don't set any points, before running this function!!!!!

Arguments sign and kind are dummy and not need to be specified Possible flag_options:

  • "ES" (from "estimate") - no time in preparing the transform, but probably sub-optimal performance
  • "M" (from "measure") - some time spend in finding the optimal way to do the transform
  • "P" (from "patient") - more time spend in finding the optimal way to do the transform
  • "EX" (from "exhaustive") - the most optimal way is found

This option should be chosen depending on how many transforms of the same size and type are going to be done. Planning is only done once, for the first transform of this size and type.

Implements TVirtualFFT.

Definition at line 148 of file TFFTComplexReal.cxx.

◆ IsA()

TClass * TFFTComplexReal::IsA ( ) const
inlineoverridevirtual
Returns
TClass describing current object

Reimplemented from TVirtualFFT.

Definition at line 66 of file TFFTComplexReal.h.

◆ IsInplace()

Bool_t TFFTComplexReal::IsInplace ( ) const
inlineoverridevirtual

Implements TVirtualFFT.

Definition at line 48 of file TFFTComplexReal.h.

◆ MapFlag()

UInt_t TFFTComplexReal::MapFlag ( Option_t flag)
protected

allowed options: "ES" - FFTW_ESTIMATE "M" - FFTW_MEASURE "P" - FFTW_PATIENT "EX" - FFTW_EXHAUSTIVE

Definition at line 390 of file TFFTComplexReal.cxx.

◆ SetPoint() [1/2]

void TFFTComplexReal::SetPoint ( const Int_t ipoint,
Double_t  re,
Double_t  im = 0 
)
overridevirtual

Set the point #ipoint.

Since the input is Hermitian, only the first (roughly) half of the points have to be set.

Implements TVirtualFFT.

Definition at line 325 of file TFFTComplexReal.cxx.

◆ SetPoint() [2/2]

void TFFTComplexReal::SetPoint ( Int_t  ipoint,
Double_t  re,
Double_t  im = 0 
)
overridevirtual

since the input must be complex-Hermitian, if the ipoint > n/2, the according point before n/2 is set to (re, -im)

Implements TVirtualFFT.

Definition at line 310 of file TFFTComplexReal.cxx.

◆ SetPointComplex()

void TFFTComplexReal::SetPointComplex ( Int_t  ipoint,
TComplex c 
)
overridevirtual

since the input must be complex-Hermitian, if the ipoint > n/2, the according point before n/2 is set to (re, -im)

Implements TVirtualFFT.

Definition at line 346 of file TFFTComplexReal.cxx.

◆ SetPoints()

void TFFTComplexReal::SetPoints ( const Double_t data)
overridevirtual

set all points.

the values are copied. points should be ordered as follows: [re_0, im_0, re_1, im_1, ..., re_n, im_n)

Implements TVirtualFFT.

Definition at line 361 of file TFFTComplexReal.cxx.

◆ SetPointsComplex()

void TFFTComplexReal::SetPointsComplex ( const Double_t re,
const Double_t im 
)
overridevirtual

Set all points. The values are copied.

Implements TVirtualFFT.

Definition at line 374 of file TFFTComplexReal.cxx.

◆ Streamer()

void TFFTComplexReal::Streamer ( TBuffer R__b)
overridevirtual

Stream an object of class TObject.

Reimplemented from TVirtualFFT.

◆ StreamerNVirtual()

void TFFTComplexReal::StreamerNVirtual ( TBuffer ClassDef_StreamerNVirtual_b)
inline

Definition at line 66 of file TFFTComplexReal.h.

◆ Transform()

void TFFTComplexReal::Transform ( )
overridevirtual

Computes the transform, specified in Init() function.

Implements TVirtualFFT.

Definition at line 165 of file TFFTComplexReal.cxx.

Member Data Documentation

◆ fFlags

TString TFFTComplexReal::fFlags
protected

Definition at line 30 of file TFFTComplexReal.h.

◆ fIn

void* TFFTComplexReal::fIn
protected

Definition at line 24 of file TFFTComplexReal.h.

◆ fN

Int_t* TFFTComplexReal::fN
protected

Definition at line 29 of file TFFTComplexReal.h.

◆ fNdim

Int_t TFFTComplexReal::fNdim
protected

Definition at line 27 of file TFFTComplexReal.h.

◆ fOut

void* TFFTComplexReal::fOut
protected

Definition at line 25 of file TFFTComplexReal.h.

◆ fPlan

void* TFFTComplexReal::fPlan
protected

Definition at line 26 of file TFFTComplexReal.h.

◆ fTotalSize

Int_t TFFTComplexReal::fTotalSize
protected

Definition at line 28 of file TFFTComplexReal.h.

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