23char cftcosi_C[] =
"$Header: /cvsroot/Lorene/C++/Source/Non_class_members/Coef/FFT991/cftcosi.C,v 1.4 2014/10/15 12:48:20 j_novak Exp $" ;
131#include "proto_f77.h"
135int* facto_ini(
int ) ;
136double* trigo_ini(
int ) ;
137double* cheb_ini(
const int) ;
138double* chebimp_ini(
const int ) ;
141void cftcosi(
const int* deg,
const int* dimf,
double* ff,
const int* dimc,
160 cout <<
"cftcosi: nt > n2f : nt = " << nt <<
" , n2f = "
166 cout <<
"cftcosi: nt > n2c : nt = " << nt <<
" , n2c = "
172 cout <<
"cftcosi: n1f > n1c : n1f = " << n1f <<
" , n1c = "
178 cout <<
"cftcosi: n3f > n3c : n3f = " << n3f <<
" , n3c = "
189 int* facto = facto_ini(nm1) ;
190 double* trigo = trigo_ini(nm1) ;
193 double* sinp = cheb_ini(nt);
196 double* x = chebimp_ini(nt);
199 double* g = (
double*)( malloc( (nm1+2)*
sizeof(
double) ) );
200 double* t1 = (
double*)( malloc( (nm1+2)*
sizeof(double) ) ) ;
211 int n2n3f = n2f * n3f ;
212 int n2n3c = n2c * n3c ;
220 int borne_phi = ( n1f > 1 ) ? n1f-1 : 1 ;
222 for (j=0; j< borne_phi; j++) {
226 for (k=0; k<n3f; k++) {
228 int i0 = n2n3f * j + k ;
229 double* ff0 = ff + i0 ;
232 double* cf0 = cf + i0 ;
238 for (i=0; i<nt-1; i++) cf0[n3c*i] = x[nm1-i] * ff0[n3f*i] ;
247 double fmoins0 = 0.5 * ( cf0[0] - cf0[ n3c*nm1 ] );
251 for ( i = 1; i < nm1s2 ; i++ ) {
257 int ixsym = n3c * isym ;
259 double fp = 0.5 * ( cf0[ix] + cf0[ixsym] ) ;
261 double fms = 0.5 * ( cf0[ix] - cf0[ixsym] ) * sinp[i] ;
266 g[0] = 0.5 * ( cf0[0] + cf0[ n3c*nm1 ] );
267 g[nm1s2] = cf0[ n3c*nm1s2 ];
272 F77_fft991( g, t1, trigo, facto, &inc, &jump, &nm1, &lot, &isign) ;
282 for (i=2; i<nm1; i += 2 ) cf0[n3c*i] = 2.* g[i] ;
283 cf0[n3c*nm1] = g[nm1] ;
293 for ( i = 3; i < nt; i += 2 ) {
294 cf0[n3c*i] = cf0[n3c*(i-2)] + 4. * g[i] ;
299 double c1 = ( fmoins0 - som ) / nm1s2 ;
303 for ( i = 3; i < nt; i += 2 ) cf0[n3c*i] += c1 ;
310 for (i=1; i<nm1; i++) {
311 cf0[n3c*i] = 2 * cf0[n3c*i] - cf0[n3c*(i-1)] ;