guilhem_lavaux/cosmotool
0
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
21507e3013
cosmotool/external/sharp/libfftpack/fftpack.c
Guilhem Lavaux bddd26a5ca Fixed error message. Imported libsharp
2012-11-10 09:01:12 -05:00

834 lines
22 KiB
C
Raw Blame History

/*
* This file is part of libfftpack.
*
* libfftpack 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.
*
* libfftpack 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 libfftpack; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* libfftpack is being developed at the Max-Planck-Institut fuer Astrophysik
* and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
* (DLR).
*/
/*
fftpack.c : A set of FFT routines in C.
Algorithmically based on Fortran-77 FFTPACK by Paul N. Swarztrauber
(Version 4, 1985).
C port by Martin Reinecke (2010)
*/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "fftpack.h"
#define WA(x,i) wa[(i)+(x)*ido]
#define CH(a,b,c) ch[(a)+ido*((b)+l1*(c))]
#define CC(a,b,c) cc[(a)+ido*((b)+cdim*(c))]
#define PM(a,b,c,d) { a=c+d; b=c-d; }
#define PMC(a,b,c,d) { a.r=c.r+d.r; a.i=c.i+d.i; b.r=c.r-d.r; b.i=c.i-d.i; }
#define ADDC(a,b,c) { a.r=b.r+c.r; a.i=b.i+c.i; }
#define SCALEC(a,b) { a.r*=b; a.i*=b; }
#define CONJFLIPC(a) { double tmp_=a.r; a.r=-a.i; a.i=tmp_; }
/* (a+ib) = conj(c+id) * (e+if) */
#define MULPM(a,b,c,d,e,f) { a=c*e+d*f; b=c*f-d*e; }
typedef struct {
double r,i;
} cmplx;
#define CONCAT(a,b) a ## b
#define X(arg) CONCAT(passb,arg)
#define BACKWARD
#include "fftpack_inc.c"
#undef BACKWARD
#undef X
#define X(arg) CONCAT(passf,arg)
#include "fftpack_inc.c"
#undef X
#undef CC
#undef CH
#define CC(a,b,c) cc[(a)+ido*((b)+l1*(c))]
#define CH(a,b,c) ch[(a)+ido*((b)+cdim*(c))]
static void radf2 (size_t ido, size_t l1, const double *cc, double *ch,
const double *wa)
{
const size_t cdim=2;
size_t i, k, ic;
double ti2, tr2;
for (k=0; k<l1; k++)
PM (CH(0,0,k),CH(ido-1,1,k),CC(0,k,0),CC(0,k,1))
if ((ido&1)==0)
for (k=0; k<l1; k++)
{
CH( 0,1,k) = -CC(ido-1,k,1);
CH(ido-1,0,k) = CC(ido-1,k,0);
}
if (ido<=2) return;
for (k=0; k<l1; k++)
for (i=2; i<ido; i+=2)
{
ic=ido-i;
MULPM (tr2,ti2,WA(0,i-2),WA(0,i-1),CC(i-1,k,1),CC(i,k,1))
PM (CH(i-1,0,k),CH(ic-1,1,k),CC(i-1,k,0),tr2)
PM (CH(i ,0,k),CH(ic ,1,k),ti2,CC(i ,k,0))
}
}
static void radf3(size_t ido, size_t l1, const double *cc, double *ch,
const double *wa)
{
const size_t cdim=3;
static const double taur=-0.5, taui=0.86602540378443864676;
size_t i, k, ic;
double ci2, di2, di3, cr2, dr2, dr3, ti2, ti3, tr2, tr3;
for (k=0; k<l1; k++)
{
cr2=CC(0,k,1)+CC(0,k,2);
CH(0,0,k) = CC(0,k,0)+cr2;
CH(0,2,k) = taui*(CC(0,k,2)-CC(0,k,1));
CH(ido-1,1,k) = CC(0,k,0)+taur*cr2;
}
if (ido==1) return;
for (k=0; k<l1; k++)
for (i=2; i<ido; i+=2)
{
ic=ido-i;
MULPM (dr2,di2,WA(0,i-2),WA(0,i-1),CC(i-1,k,1),CC(i,k,1))
MULPM (dr3,di3,WA(1,i-2),WA(1,i-1),CC(i-1,k,2),CC(i,k,2))
cr2=dr2+dr3;
ci2=di2+di3;
CH(i-1,0,k) = CC(i-1,k,0)+cr2;
CH(i ,0,k) = CC(i ,k,0)+ci2;
tr2 = CC(i-1,k,0)+taur*cr2;
ti2 = CC(i ,k,0)+taur*ci2;
tr3 = taui*(di2-di3);
ti3 = taui*(dr3-dr2);
PM(CH(i-1,2,k),CH(ic-1,1,k),tr2,tr3)
PM(CH(i ,2,k),CH(ic ,1,k),ti3,ti2)
}
}
static void radf4(size_t ido, size_t l1, const double *cc, double *ch,
const double *wa)
{
const size_t cdim=4;
static const double hsqt2=0.70710678118654752440;
size_t i, k, ic;
double ci2, ci3, ci4, cr2, cr3, cr4, ti1, ti2, ti3, ti4, tr1, tr2, tr3, tr4;
for (k=0; k<l1; k++)
{
PM (tr1,CH(0,2,k),CC(0,k,3),CC(0,k,1))
PM (tr2,CH(ido-1,1,k),CC(0,k,0),CC(0,k,2))
PM (CH(0,0,k),CH(ido-1,3,k),tr2,tr1)
}
if ((ido&1)==0)
for (k=0; k<l1; k++)
{
ti1=-hsqt2*(CC(ido-1,k,1)+CC(ido-1,k,3));
tr1= hsqt2*(CC(ido-1,k,1)-CC(ido-1,k,3));
PM (CH(ido-1,0,k),CH(ido-1,2,k),CC(ido-1,k,0),tr1)
PM (CH( 0,3,k),CH( 0,1,k),ti1,CC(ido-1,k,2))
}
if (ido<=2) return;
for (k=0; k<l1; k++)
for (i=2; i<ido; i+=2)
{
ic=ido-i;
MULPM(cr2,ci2,WA(0,i-2),WA(0,i-1),CC(i-1,k,1),CC(i,k,1))
MULPM(cr3,ci3,WA(1,i-2),WA(1,i-1),CC(i-1,k,2),CC(i,k,2))
MULPM(cr4,ci4,WA(2,i-2),WA(2,i-1),CC(i-1,k,3),CC(i,k,3))
PM(tr1,tr4,cr4,cr2)
PM(ti1,ti4,ci2,ci4)
PM(tr2,tr3,CC(i-1,k,0),cr3)
PM(ti2,ti3,CC(i ,k,0),ci3)
PM(CH(i-1,0,k),CH(ic-1,3,k),tr2,tr1)
PM(CH(i ,0,k),CH(ic ,3,k),ti1,ti2)
PM(CH(i-1,2,k),CH(ic-1,1,k),tr3,ti4)
PM(CH(i ,2,k),CH(ic ,1,k),tr4,ti3)
}
}
static void radf5(size_t ido, size_t l1, const double *cc, double *ch,
const double *wa)
{
const size_t cdim=5;
static const double tr11= 0.3090169943749474241, ti11=0.95105651629515357212,
tr12=-0.8090169943749474241, ti12=0.58778525229247312917;
size_t i, k, ic;
double ci2, di2, ci4, ci5, di3, di4, di5, ci3, cr2, cr3, dr2, dr3,
dr4, dr5, cr5, cr4, ti2, ti3, ti5, ti4, tr2, tr3, tr4, tr5;
for (k=0; k<l1; k++)
{
PM (cr2,ci5,CC(0,k,4),CC(0,k,1))
PM (cr3,ci4,CC(0,k,3),CC(0,k,2))
CH(0,0,k)=CC(0,k,0)+cr2+cr3;
CH(ido-1,1,k)=CC(0,k,0)+tr11*cr2+tr12*cr3;
CH(0,2,k)=ti11*ci5+ti12*ci4;
CH(ido-1,3,k)=CC(0,k,0)+tr12*cr2+tr11*cr3;
CH(0,4,k)=ti12*ci5-ti11*ci4;
}
if (ido==1) return;
for (k=0; k<l1;++k)
for (i=2; i<ido; i+=2)
{
ic=ido-i;
MULPM (dr2,di2,WA(0,i-2),WA(0,i-1),CC(i-1,k,1),CC(i,k,1))
MULPM (dr3,di3,WA(1,i-2),WA(1,i-1),CC(i-1,k,2),CC(i,k,2))
MULPM (dr4,di4,WA(2,i-2),WA(2,i-1),CC(i-1,k,3),CC(i,k,3))
MULPM (dr5,di5,WA(3,i-2),WA(3,i-1),CC(i-1,k,4),CC(i,k,4))
PM(cr2,ci5,dr5,dr2)
PM(ci2,cr5,di2,di5)
PM(cr3,ci4,dr4,dr3)
PM(ci3,cr4,di3,di4)
CH(i-1,0,k)=CC(i-1,k,0)+cr2+cr3;
CH(i ,0,k)=CC(i ,k,0)+ci2+ci3;
tr2=CC(i-1,k,0)+tr11*cr2+tr12*cr3;
ti2=CC(i ,k,0)+tr11*ci2+tr12*ci3;
tr3=CC(i-1,k,0)+tr12*cr2+tr11*cr3;
ti3=CC(i ,k,0)+tr12*ci2+tr11*ci3;
MULPM(tr5,tr4,cr5,cr4,ti11,ti12)
MULPM(ti5,ti4,ci5,ci4,ti11,ti12)
PM(CH(i-1,2,k),CH(ic-1,1,k),tr2,tr5)
PM(CH(i ,2,k),CH(ic ,1,k),ti5,ti2)
PM(CH(i-1,4,k),CH(ic-1,3,k),tr3,tr4)
PM(CH(i ,4,k),CH(ic ,3,k),ti4,ti3)
}
}
#undef CH
#undef CC
#define CH(a,b,c) ch[(a)+ido*((b)+l1*(c))]
#define CC(a,b,c) cc[(a)+ido*((b)+cdim*(c))]
#define C1(a,b,c) cc[(a)+ido*((b)+l1*(c))]
#define C2(a,b) cc[(a)+idl1*(b)]
#define CH2(a,b) ch[(a)+idl1*(b)]
static void radfg(size_t ido, size_t ip, size_t l1, size_t idl1,
double *cc, double *ch, const double *wa)
{
const size_t cdim=ip;
static const double twopi=6.28318530717958647692;
size_t idij, ipph, i, j, k, l, j2, ic, jc, lc, ik;
double ai1, ai2, ar1, ar2, arg;
double *csarr;
size_t aidx;
ipph=(ip+1)/ 2;
if(ido!=1)
{
memcpy(ch,cc,idl1*sizeof(double));
for(j=1; j<ip; j++)
for(k=0; k<l1; k++)
{
CH(0,k,j)=C1(0,k,j);
idij=(j-1)*ido+1;
for(i=2; i<ido; i+=2,idij+=2)
MULPM(CH(i-1,k,j),CH(i,k,j),wa[idij-1],wa[idij],C1(i-1,k,j),C1(i,k,j))
}
for(j=1,jc=ip-1; j<ipph; j++,jc--)
for(k=0; k<l1; k++)
for(i=2; i<ido; i+=2)
{
PM(C1(i-1,k,j),C1(i ,k,jc),CH(i-1,k,jc),CH(i-1,k,j ))
PM(C1(i ,k,j),C1(i-1,k,jc),CH(i ,k,j ),CH(i ,k,jc))
}
}
else
memcpy(cc,ch,idl1*sizeof(double));
for(j=1,jc=ip-1; j<ipph; j++,jc--)
for(k=0; k<l1; k++)
PM(C1(0,k,j),C1(0,k,jc),CH(0,k,jc),CH(0,k,j))
csarr=RALLOC(double,2*ip);
arg=twopi / ip;
csarr[0]=1.;
csarr[1]=0.;
csarr[2]=csarr[2*ip-2]=cos(arg);
csarr[3]=sin(arg); csarr[2*ip-1]=-csarr[3];
for (i=2; i<=ip/2; ++i)
{
csarr[2*i]=csarr[2*ip-2*i]=cos(i*arg);
csarr[2*i+1]=sin(i*arg);
csarr[2*ip-2*i+1]=-csarr[2*i+1];
}
for(l=1,lc=ip-1; l<ipph; l++,lc--)
{
ar1=csarr[2*l];
ai1=csarr[2*l+1];
for(ik=0; ik<idl1; ik++)
{
CH2(ik,l)=C2(ik,0)+ar1*C2(ik,1);
CH2(ik,lc)=ai1*C2(ik,ip-1);
}
aidx=2*l;
for(j=2,jc=ip-2; j<ipph; j++,jc--)
{
aidx+=2*l;
if (aidx>=2*ip) aidx-=2*ip;
ar2=csarr[aidx];
ai2=csarr[aidx+1];
for(ik=0; ik<idl1; ik++)
{
CH2(ik,l )+=ar2*C2(ik,j );
CH2(ik,lc)+=ai2*C2(ik,jc);
}
}
}
DEALLOC(csarr);
for(j=1; j<ipph; j++)
for(ik=0; ik<idl1; ik++)
CH2(ik,0)+=C2(ik,j);
for(k=0; k<l1; k++)
memcpy(&CC(0,0,k),&CH(0,k,0),ido*sizeof(double));
for(j=1; j<ipph; j++)
{
jc=ip-j;
j2=2*j;
for(k=0; k<l1; k++)
{
CC(ido-1,j2-1,k) = CH(0,k,j );
CC(0 ,j2 ,k) = CH(0,k,jc);
}
}
if(ido==1) return;
for(j=1; j<ipph; j++)
{
jc=ip-j;
j2=2*j;
for(k=0; k<l1; k++)
for(i=2; i<ido; i+=2)
{
ic=ido-i;
PM (CC(i-1,j2,k),CC(ic-1,j2-1,k),CH(i-1,k,j ),CH(i-1,k,jc))
PM (CC(i ,j2,k),CC(ic ,j2-1,k),CH(i ,k,jc),CH(i ,k,j ))
}
}
}
#undef CC
#undef CH
#define CH(a,b,c) ch[(a)+ido*((b)+l1*(c))]
#define CC(a,b,c) cc[(a)+ido*((b)+cdim*(c))]
static void radb2(size_t ido, size_t l1, const double *cc, double *ch,
const double *wa)
{
const size_t cdim=2;
size_t i, k, ic;
double ti2, tr2;
for (k=0; k<l1; k++)
PM (CH(0,k,0),CH(0,k,1),CC(0,0,k),CC(ido-1,1,k))
if ((ido&1)==0)
for (k=0; k<l1; k++)
{
CH(ido-1,k,0) = 2*CC(ido-1,0,k);
CH(ido-1,k,1) = -2*CC(0 ,1,k);
}
if (ido<=2) return;
for (k=0; k<l1;++k)
for (i=2; i<ido; i+=2)
{
ic=ido-i;
PM (CH(i-1,k,0),tr2,CC(i-1,0,k),CC(ic-1,1,k))
PM (ti2,CH(i ,k,0),CC(i ,0,k),CC(ic ,1,k))
MULPM (CH(i,k,1),CH(i-1,k,1),WA(0,i-2),WA(0,i-1),ti2,tr2)
}
}
static void radb3(size_t ido, size_t l1, const double *cc, double *ch,
const double *wa)
{
const size_t cdim=3;
static const double taur=-0.5, taui=0.86602540378443864676;
size_t i, k, ic;
double ci2, ci3, di2, di3, cr2, cr3, dr2, dr3, ti2, tr2;
for (k=0; k<l1; k++)
{
tr2=2*CC(ido-1,1,k);
cr2=CC(0,0,k)+taur*tr2;
CH(0,k,0)=CC(0,0,k)+tr2;
ci3=2*taui*CC(0,2,k);
PM (CH(0,k,2),CH(0,k,1),cr2,ci3);
}
if (ido==1) return;
for (k=0; k<l1; k++)
for (i=2; i<ido; i+=2)
{
ic=ido-i;
tr2=CC(i-1,2,k)+CC(ic-1,1,k);
ti2=CC(i ,2,k)-CC(ic ,1,k);
cr2=CC(i-1,0,k)+taur*tr2;
ci2=CC(i ,0,k)+taur*ti2;
CH(i-1,k,0)=CC(i-1,0,k)+tr2;
CH(i ,k,0)=CC(i ,0,k)+ti2;
cr3=taui*(CC(i-1,2,k)-CC(ic-1,1,k));
ci3=taui*(CC(i ,2,k)+CC(ic ,1,k));
PM(dr3,dr2,cr2,ci3)
PM(di2,di3,ci2,cr3)
MULPM(CH(i,k,1),CH(i-1,k,1),WA(0,i-2),WA(0,i-1),di2,dr2)
MULPM(CH(i,k,2),CH(i-1,k,2),WA(1,i-2),WA(1,i-1),di3,dr3)
}
}
static void radb4(size_t ido, size_t l1, const double *cc, double *ch,
const double *wa)
{
const size_t cdim=4;
static const double sqrt2=1.41421356237309504880;
size_t i, k, ic;
double ci2, ci3, ci4, cr2, cr3, cr4, ti1, ti2, ti3, ti4, tr1, tr2, tr3, tr4;
for (k=0; k<l1; k++)
{
PM (tr2,tr1,CC(0,0,k),CC(ido-1,3,k))
tr3=2*CC(ido-1,1,k);
tr4=2*CC(0,2,k);
PM (CH(0,k,0),CH(0,k,2),tr2,tr3)
PM (CH(0,k,3),CH(0,k,1),tr1,tr4)
}
if ((ido&1)==0)
for (k=0; k<l1; k++)
{
PM (ti1,ti2,CC(0 ,3,k),CC(0 ,1,k))
PM (tr2,tr1,CC(ido-1,0,k),CC(ido-1,2,k))
CH(ido-1,k,0)=tr2+tr2;
CH(ido-1,k,1)=sqrt2*(tr1-ti1);
CH(ido-1,k,2)=ti2+ti2;
CH(ido-1,k,3)=-sqrt2*(tr1+ti1);
}
if (ido<=2) return;
for (k=0; k<l1;++k)
for (i=2; i<ido; i+=2)
{
ic=ido-i;
PM (tr2,tr1,CC(i-1,0,k),CC(ic-1,3,k))
PM (ti1,ti2,CC(i ,0,k),CC(ic ,3,k))
PM (tr4,ti3,CC(i ,2,k),CC(ic ,1,k))
PM (tr3,ti4,CC(i-1,2,k),CC(ic-1,1,k))
PM (CH(i-1,k,0),cr3,tr2,tr3)
PM (CH(i ,k,0),ci3,ti2,ti3)
PM (cr4,cr2,tr1,tr4)
PM (ci2,ci4,ti1,ti4)
MULPM (CH(i,k,1),CH(i-1,k,1),WA(0,i-2),WA(0,i-1),ci2,cr2)
MULPM (CH(i,k,2),CH(i-1,k,2),WA(1,i-2),WA(1,i-1),ci3,cr3)
MULPM (CH(i,k,3),CH(i-1,k,3),WA(2,i-2),WA(2,i-1),ci4,cr4)
}
}
static void radb5(size_t ido, size_t l1, const double *cc, double *ch,
const double *wa)
{
const size_t cdim=5;
static const double tr11= 0.3090169943749474241, ti11=0.95105651629515357212,
tr12=-0.8090169943749474241, ti12=0.58778525229247312917;
size_t i, k, ic;
double ci2, ci3, ci4, ci5, di3, di4, di5, di2, cr2, cr3, cr5, cr4,
ti2, ti3, ti4, ti5, dr3, dr4, dr5, dr2, tr2, tr3, tr4, tr5;
for (k=0; k<l1; k++)
{
ti5=2*CC(0,2,k);
ti4=2*CC(0,4,k);
tr2=2*CC(ido-1,1,k);
tr3=2*CC(ido-1,3,k);
CH(0,k,0)=CC(0,0,k)+tr2+tr3;
cr2=CC(0,0,k)+tr11*tr2+tr12*tr3;
cr3=CC(0,0,k)+tr12*tr2+tr11*tr3;
MULPM(ci5,ci4,ti5,ti4,ti11,ti12)
PM(CH(0,k,4),CH(0,k,1),cr2,ci5)
PM(CH(0,k,3),CH(0,k,2),cr3,ci4)
}
if (ido==1) return;
for (k=0; k<l1;++k)
for (i=2; i<ido; i+=2)
{
ic=ido-i;
PM(tr2,tr5,CC(i-1,2,k),CC(ic-1,1,k))
PM(ti5,ti2,CC(i ,2,k),CC(ic ,1,k))
PM(tr3,tr4,CC(i-1,4,k),CC(ic-1,3,k))
PM(ti4,ti3,CC(i ,4,k),CC(ic ,3,k))
CH(i-1,k,0)=CC(i-1,0,k)+tr2+tr3;
CH(i ,k,0)=CC(i ,0,k)+ti2+ti3;
cr2=CC(i-1,0,k)+tr11*tr2+tr12*tr3;
ci2=CC(i ,0,k)+tr11*ti2+tr12*ti3;
cr3=CC(i-1,0,k)+tr12*tr2+tr11*tr3;
ci3=CC(i ,0,k)+tr12*ti2+tr11*ti3;
MULPM(cr5,cr4,tr5,tr4,ti11,ti12)
MULPM(ci5,ci4,ti5,ti4,ti11,ti12)
PM(dr4,dr3,cr3,ci4)
PM(di3,di4,ci3,cr4)
PM(dr5,dr2,cr2,ci5)
PM(di2,di5,ci2,cr5)
MULPM(CH(i,k,1),CH(i-1,k,1),WA(0,i-2),WA(0,i-1),di2,dr2)
MULPM(CH(i,k,2),CH(i-1,k,2),WA(1,i-2),WA(1,i-1),di3,dr3)
MULPM(CH(i,k,3),CH(i-1,k,3),WA(2,i-2),WA(2,i-1),di4,dr4)
MULPM(CH(i,k,4),CH(i-1,k,4),WA(3,i-2),WA(3,i-1),di5,dr5)
}
}
static void radbg(size_t ido, size_t ip, size_t l1, size_t idl1,
double *cc, double *ch, const double *wa)
{
const size_t cdim=ip;
static const double twopi=6.28318530717958647692;
size_t idij, ipph, i, j, k, l, j2, ic, jc, lc, ik;
double ai1, ai2, ar1, ar2, arg;
double *csarr;
size_t aidx;
ipph=(ip+1)/ 2;
for(k=0; k<l1; k++)
memcpy(&CH(0,k,0),&CC(0,0,k),ido*sizeof(double));
for(j=1; j<ipph; j++)
{
jc=ip-j;
j2=2*j;
for(k=0; k<l1; k++)
{
CH(0,k,j )=2*CC(ido-1,j2-1,k);
CH(0,k,jc)=2*CC(0 ,j2 ,k);
}
}
if(ido!=1)
for(j=1,jc=ip-1; j<ipph; j++,jc--)
for(k=0; k<l1; k++)
for(i=2; i<ido; i+=2)
{
ic=ido-i;
PM (CH(i-1,k,j ),CH(i-1,k,jc),CC(i-1,2*j,k),CC(ic-1,2*j-1,k))
PM (CH(i ,k,jc),CH(i ,k,j ),CC(i ,2*j,k),CC(ic ,2*j-1,k))
}
csarr=RALLOC(double,2*ip);
arg=twopi/ip;
csarr[0]=1.;
csarr[1]=0.;
csarr[2]=csarr[2*ip-2]=cos(arg);
csarr[3]=sin(arg); csarr[2*ip-1]=-csarr[3];
for (i=2; i<=ip/2; ++i)
{
csarr[2*i]=csarr[2*ip-2*i]=cos(i*arg);
csarr[2*i+1]=sin(i*arg);
csarr[2*ip-2*i+1]=-csarr[2*i+1];
}
for(l=1; l<ipph; l++)
{
lc=ip-l;
ar1=csarr[2*l];
ai1=csarr[2*l+1];
for(ik=0; ik<idl1; ik++)
{
C2(ik,l)=CH2(ik,0)+ar1*CH2(ik,1);
C2(ik,lc)=ai1*CH2(ik,ip-1);
}
aidx=2*l;
for(j=2; j<ipph; j++)
{
jc=ip-j;
aidx+=2*l;
if (aidx>=2*ip) aidx-=2*ip;
ar2=csarr[aidx];
ai2=csarr[aidx+1];
for(ik=0; ik<idl1; ik++)
{
C2(ik,l )+=ar2*CH2(ik,j );
C2(ik,lc)+=ai2*CH2(ik,jc);
}
}
}
DEALLOC(csarr);
for(j=1; j<ipph; j++)
for(ik=0; ik<idl1; ik++)
CH2(ik,0)+=CH2(ik,j);
for(j=1,jc=ip-1; j<ipph; j++,jc--)
for(k=0; k<l1; k++)
PM (CH(0,k,jc),CH(0,k,j),C1(0,k,j),C1(0,k,jc))
if(ido==1)
return;
for(j=1,jc=ip-1; j<ipph; j++,jc--)
for(k=0; k<l1; k++)
for(i=2; i<ido; i+=2)
{
PM (CH(i-1,k,jc),CH(i-1,k,j ),C1(i-1,k,j),C1(i ,k,jc))
PM (CH(i ,k,j ),CH(i ,k,jc),C1(i ,k,j),C1(i-1,k,jc))
}
memcpy(cc,ch,idl1*sizeof(double));
for(j=1; j<ip; j++)
for(k=0; k<l1; k++)
{
C1(0,k,j)=CH(0,k,j);
idij=(j-1)*ido+1;
for(i=2; i<ido; i+=2,idij+=2)
MULPM (C1(i,k,j),C1(i-1,k,j),wa[idij-1],wa[idij],CH(i,k,j),CH(i-1,k,j))
}
}
#undef CC
#undef CH
#undef PM
#undef MULPM
/*----------------------------------------------------------------------
cfftf1, cfftb1, cfftf, cfftb, cffti1, cffti. Complex FFTs.
----------------------------------------------------------------------*/
static void cfft1(size_t n, cmplx c[], cmplx ch[], const cmplx wa[],
const size_t ifac[], int isign)
{
size_t k1, l1=1, nf=ifac[1], iw=0;
cmplx *p1=c, *p2=ch;
for(k1=0; k1<nf; k1++)
{
size_t ip=ifac[k1+2];
size_t l2=ip*l1;
size_t ido = n/l2;
if(ip==4)
(isign>0) ? passb4(ido, l1, p1, p2, wa+iw)
: passf4(ido, l1, p1, p2, wa+iw);
else if(ip==2)
(isign>0) ? passb2(ido, l1, p1, p2, wa+iw)
: passf2(ido, l1, p1, p2, wa+iw);
else if(ip==3)
(isign>0) ? passb3(ido, l1, p1, p2, wa+iw)
: passf3(ido, l1, p1, p2, wa+iw);
else if(ip==5)
(isign>0) ? passb5(ido, l1, p1, p2, wa+iw)
: passf5(ido, l1, p1, p2, wa+iw);
else if(ip==6)
(isign>0) ? passb6(ido, l1, p1, p2, wa+iw)
: passf6(ido, l1, p1, p2, wa+iw);
else
(isign>0) ? passbg(ido, ip, l1, p1, p2, wa+iw)
: passfg(ido, ip, l1, p1, p2, wa+iw);
SWAP(p1,p2,cmplx *);
l1=l2;
iw+=(ip-1)*ido;
}
if (p1!=c)
memcpy (c,p1,n*sizeof(cmplx));
}
void cfftf(size_t n, double c[], double wsave[])
{
if (n!=1)
cfft1(n, (cmplx*)c, (cmplx*)wsave, (cmplx*)(wsave+2*n),
(size_t*)(wsave+4*n),-1);
}
void cfftb(size_t n, double c[], double wsave[])
{
if (n!=1)
cfft1(n, (cmplx*)c, (cmplx*)wsave, (cmplx*)(wsave+2*n),
(size_t*)(wsave+4*n),+1);
}
static void factorize (size_t n, const size_t *pf, size_t npf, size_t *ifac)
{
size_t nl=n, nf=0, ntry=0, j=0, i;
startloop:
j++;
ntry = (j<=npf) ? pf[j-1] : ntry+2;
do
{
size_t nq=nl / ntry;
size_t nr=nl-ntry*nq;
if (nr!=0)
goto startloop;
nf++;
ifac[nf+1]=ntry;
nl=nq;
if ((ntry==2) && (nf!=1))
{
for (i=nf+1; i>2; --i)
ifac[i]=ifac[i-1];
ifac[2]=2;
}
}
while(nl!=1);
ifac[0]=n;
ifac[1]=nf;
}
static void cffti1(size_t n, double wa[], size_t ifac[])
{
static const size_t ntryh[5]={4,6,3,2,5};
static const double twopi=6.28318530717958647692;
size_t j, k, fi;
double argh=twopi/n;
size_t i=0, l1=1;
factorize (n,ntryh,5,ifac);
for(k=1; k<=ifac[1]; k++)
{
size_t ip=ifac[k+1];
size_t ido=n/(l1*ip);
for(j=1; j<ip; j++)
{
size_t is = i;
double argld=j*l1*argh;
wa[i ]=1;
wa[i+1]=0;
for(fi=1; fi<=ido; fi++)
{
double arg=fi*argld;
i+=2;
wa[i ]=cos(arg);
wa[i+1]=sin(arg);
}
if(ip>6)
{
wa[is ]=wa[i ];
wa[is+1]=wa[i+1];
}
}
l1*=ip;
}
}
void cffti(size_t n, double wsave[])
{ if (n!=1) cffti1(n, wsave+2*n,(size_t*)(wsave+4*n)); }
/*----------------------------------------------------------------------
rfftf1, rfftb1, rfftf, rfftb, rffti1, rffti. Real FFTs.
----------------------------------------------------------------------*/
static void rfftf1(size_t n, double c[], double ch[], const double wa[],
const size_t ifac[])
{
size_t k1, l1=n, nf=ifac[1], iw=n-1;
double *p1=ch, *p2=c;
for(k1=1; k1<=nf;++k1)
{
size_t ip=ifac[nf-k1+2];
size_t ido=n / l1;
l1 /= ip;
iw-=(ip-1)*ido;
SWAP (p1,p2,double *);
if(ip==4)
radf4(ido, l1, p1, p2, wa+iw);
else if(ip==2)
radf2(ido, l1, p1, p2, wa+iw);
else if(ip==3)
radf3(ido, l1, p1, p2, wa+iw);
else if(ip==5)
radf5(ido, l1, p1, p2, wa+iw);
else
{
if (ido==1)
SWAP (p1,p2,double *);
radfg(ido, ip, l1, ido*l1, p1, p2, wa+iw);
SWAP (p1,p2,double *);
}
}
if (p1==c)
memcpy (c,ch,n*sizeof(double));
}
static void rfftb1(size_t n, double c[], double ch[], const double wa[],
const size_t ifac[])
{
size_t k1, l1=1, nf=ifac[1], iw=0;
double *p1=c, *p2=ch;
for(k1=1; k1<=nf; k1++)
{
size_t ip = ifac[k1+1],
ido= n/(ip*l1);
if(ip==4)
radb4(ido, l1, p1, p2, wa+iw);
else if(ip==2)
radb2(ido, l1, p1, p2, wa+iw);
else if(ip==3)
radb3(ido, l1, p1, p2, wa+iw);
else if(ip==5)
radb5(ido, l1, p1, p2, wa+iw);
else
{
radbg(ido, ip, l1, ido*l1, p1, p2, wa+iw);
if (ido!=1)
SWAP (p1,p2,double *);
}
SWAP (p1,p2,double *);
l1*=ip;
iw+=(ip-1)*ido;
}
if (p1!=c)
memcpy (c,ch,n*sizeof(double));
}
void rfftf(size_t n, double r[], double wsave[])
{ if(n!=1) rfftf1(n, r, wsave, wsave+n,(size_t*)(wsave+2*n)); }
void rfftb(size_t n, double r[], double wsave[])
{ if(n!=1) rfftb1(n, r, wsave, wsave+n,(size_t*)(wsave+2*n)); }
static void rffti1(size_t n, double wa[], size_t ifac[])
{
static const size_t ntryh[4]={4,2,3,5};
static const double twopi=6.28318530717958647692;
size_t i, j, k, fi;
double argh=twopi/n;
size_t is=0, l1=1;
factorize (n,ntryh,4,ifac);
for (k=1; k<ifac[1]; k++)
{
size_t ip=ifac[k+1],
ido=n/(l1*ip);
for (j=1; j<ip; ++j)
{
double argld=j*l1*argh;
for(i=is,fi=1; i<=ido+is-3; i+=2,++fi)
{
double arg=fi*argld;
wa[i ]=cos(arg);
wa[i+1]=sin(arg);
}
is+=ido;
}
l1*=ip;
}
}
void rffti(size_t n, double wsave[])
{ if (n!=1) rffti1(n, wsave+n,(size_t*)(wsave+2*n)); }
Reference in New Issue View Git Blame Copy Permalink