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/* cassbeam - a Cassegrain antenna simulator
Copyright (C) August 18, 2003 Walter Brisken
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA*/
#ifndef __VECTOR_FFTW_H__
#define __VECTOR_FFTW_H__
#include <math.h>
#include <fftw.h>
#include <rfftw.h>
#include "vector.h"
#define SMOOTH_GAUSS 1
#define SMOOTH_COS 2
#define SMOOTH_COS1 3
#define SMOOTH_BOX 4
#define SMOOTH_TRIANGLE 5
/* This function grids a non-evenly sampled datum onto the FT plane */
int Matrixcomplexgrid(Matrix M, double u, double v, double re, double im,int p);
/* These use FFTW for the transform. Don't use these if many fast transforms
* are needed -- use plans and the fftw functions in those cases
*
* dir is one of: FFTW_FORWARD or FFTW_BACKWARD for complex (FFT) transforms
* or: FFTW_REAL_TO_COMPLEX or FFTW_REAL_TO_COMPLEX for real (RFFT)
*/
Vector VectorFFT(Vector V, fftw_direction dir);
Vector VectorRFFT(Vector V, fftw_direction dir);
void smoothVector(Vector V, double width, int type);
/* Notes for Matrix transforms:
* 1. all real side of RFFT transforms are represented in FFTW's
* native order
* 2. input arrays for all RFFT operations are assumed to have 2 extra
* floating point values padding each row. These matrices can be
* created with newpaddedMatrix(Ny, Nx, pad = 2)
*/
void MatrixFFT(Matrix M, fftw_direction dir);
void MatrixFFTrows(Matrix M, fftw_direction dir);
void MatrixFFTcolumns(Matrix M, fftw_direction dir);
void MatrixRFFT(Matrix M, fftw_direction dir);
void MatrixRFFTrows(Matrix M, fftw_direction dir);
Matrix Matrixcrosscorrelate(const Matrix M, const Matrix N);
Matrix Matrixautocorrelate(const Matrix M);
void Matrixconvolve(Matrix M, const Matrix N);
void Matrixdeconvolve(Matrix M, const Matrix N);
#endif
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