23char cftcosp_C[] =
"$Header: /cvsroot/Lorene/C++/Source/Non_class_members/Coef/FFT991/cftcosp.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) ;
140void cftcosp(
const int* deg,
const int* dimf,
double* ff,
const int* dimc,
159 cout <<
"cftcosp: nt > n2f : nt = " << nt <<
" , n2f = "
165 cout <<
"cftcosp: nt > n2c : nt = " << nt <<
" , n2c = "
171 cout <<
"cftcosp: n1f > n1c : n1f = " << n1f <<
" , n1c = "
177 cout <<
"cftcosp: n3f > n3c : n3f = " << n3f <<
" , n3c = "
188 int* facto = facto_ini(nm1) ;
189 double* trigo = trigo_ini(nm1) ;
192 double* sinp = cheb_ini(nt);
196 double* g = (
double*)( malloc( (nm1+2)*
sizeof(
double) ) );
197 double* t1 = (
double*)( malloc( (nm1+2)*
sizeof(double) ) ) ;
208 int n2n3f = n2f * n3f ;
209 int n2n3c = n2c * n3c ;
217 int borne_phi = ( n1f > 1 ) ? n1f-1 : 1 ;
219 for (j=0; j< borne_phi; j++) {
223 for (k=0; k<n3f; k++) {
225 int i0 = n2n3f * j + k ;
226 double* ff0 = ff + i0 ;
229 double* cf0 = cf + i0 ;
237 double fmoins0 = 0.5 * ( ff0[0] - ff0[ n3f*nm1 ] );
241 for ( i = 1; i < nm1s2 ; i++ ) {
247 int ixsym = n3f * isym ;
249 double fp = 0.5 * ( ff0[ix] + ff0[ixsym] ) ;
251 double fms = 0.5 * ( ff0[ix] - ff0[ixsym] ) * sinp[i] ;
256 g[0] = 0.5 * ( ff0[0] + ff0[ n3f*nm1 ] );
257 g[nm1s2] = ff0[ n3f*nm1s2 ];
262 F77_fft991( g, t1, trigo, facto, &inc, &jump, &nm1, &lot, &isign) ;
271 for (i=2; i<nm1; i += 2 ) cf0[n3c*i] = 2.* g[i] ;
272 cf0[n3c*nm1] = g[nm1] ;
282 for ( i = 3; i < nt; i += 2 ) {
283 cf0[n3c*i] = cf0[n3c*(i-2)] + 4. * g[i] ;
288 double c1 = ( fmoins0 - som ) / nm1s2 ;
292 for ( i = 3; i < nt; i += 2 ) cf0[n3c*i] += c1 ;