DFTServer.h

Go to the documentation of this file.

//# DFTServer.h: This class contains methods for doing n-D slow Fourier transforms
//# Copyright (C) 1994,1995,1996,1999,2000,2001,2003
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: casa-feedback@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
 
#ifndef SCIMATH_DFTSERVER_H
#define SCIMATH_DFTSERVER_H
 
 
#include <casacore/casa/aips.h>
#include <casacore/casa/BasicMath/Math.h>
#include <casacore/casa/Exceptions/Error.h>
#include <casacore/casa/Arrays/Array.h>
#include <casacore/casa/Arrays/ArrayMath.h>
#include <casacore/casa/Arrays/ArrayIter.h> 
#include <casacore/casa/IO/ArrayIO.h> 
#include <casacore/casa/math.h> 
 
namespace casacore { //# NAMESPACE CASACORE - BEGIN
 
template<class T> class Matrix;
 
// <summary>
// Error class for <linkto class=DFTServer>DFTServer</linkto> class
// </summary>
 
// <synopsis>
// Error class for <linkto class=DFTServer>DFTServer</linkto> class.
// </synopsis>
 
class DFTError: public AipsError
{
public:
   DFTError(): AipsError("DFTError") {}
   DFTError(const Char *m) : AipsError(m) {}
   DFTError(const String &m) : AipsError(m) {}
 
   virtual ~DFTError() noexcept {}
};
 
// <summary>
// Class containing methods for doing n-D slow Fourier transforms
// </summary>
 
// <synopsis>
// The DFTServer class contains methods for doing n-dimensional 
// Slow Fourier Transforms. (In practice, the maximum dimension is 3).
//
// </synopsis>
 
template<class T> 
class DFTServer 
{
public:
// default constructor
   DFTServer();
 
// copy constructor
   DFTServer(const DFTServer<T> &);
 
// Other constructors
// <group>
   DFTServer(Array<T> &, Array<T> &);
   DFTServer(int, int, int);
   DFTServer(IPosition &, IPosition &);
// </group>
 
// destructor
   ~DFTServer();
 
// assignment
   DFTServer<T>  &operator=(const DFTServer<T> &);
 
// n-d real <src> <-> </src> complex dft
   void rcdft(Array<T> &, Array<T> &);
 
// n-d complex <src> <-> </src> real dft
   void crdft(Array<T> &, Array<T> &);
 
// n-d complex <src> <-> </src> complex dft
   void cxdft(Array<T> &, Array<T> &, int);
 
// display only the real component of the data 
   void showReal(Array<T> &);
 
// display both the real and the imaginary components of the data 
   void showComplex(Array<T> &);
 
private:
   // dimension of the both input and output data
   int dimension;
 
   // number of time data points
   int numTime;
 
   // number of frequency data points
   int numFreq;
 
   // set to 1 (true) if a crfft is done
   int crFlag;
 
 
// does a complex to complex DFT
   void c2c(Matrix<T> &,  Matrix<T> &, int);
 
// turn a general array into a matrix
   Matrix<T> getMatrix(Array<T> &);
 
};
 
 
} //# NAMESPACE CASACORE - END
 
#ifndef CASACORE_NO_AUTO_TEMPLATES
#include <casacore/scimath/Mathematics/DFTServer.tcc>
#endif //# CASACORE_NO_AUTO_TEMPLATES
#endif //DFT_SERVER