23char cfrchebi_C[] =
"$Header: /cvsroot/Lorene/C++/Source/Non_class_members/Coef/FFTW3/cfrchebi.C,v 1.3 2014/10/13 08:53:18 j_novak Exp $" ;
136fftw_plan prepare_fft(
int, Tbl*&) ;
137double* cheb_ini(
const int) ;
138double* chebimp_ini(
const int ) ;
142void cfrchebi(
const int* deg,
const int* dimf,
double* ff,
const int* dimc,
162 cout <<
"cfrchebi: nr > n3f : nr = " << nr <<
" , n3f = "
168 cout <<
"cfrchebi: nr > n3c : nr = " << nr <<
" , n3c = "
174 cout <<
"cfrchebi: n1f > n1c : n1f = " << n1f <<
" , n1c = "
180 cout <<
"cfrchebi: n2f > n2c : n2f = " << n2f <<
" , n2c = "
192 fftw_plan p = prepare_fft(nm1, pg) ;
196 double* sinp = cheb_ini(nr);
199 double* x = chebimp_ini(nr);
203 int n2n3f = n2f * n3f ;
204 int n2n3c = n2c * n3c ;
212 int borne_phi = ( n1f > 1 ) ? n1f-1 : 1 ;
214 for (j=0; j< borne_phi; j++) {
218 for (k=0; k<n2f; k++) {
220 int i0 = n2n3f * j + n3f * k ;
221 double* ff0 = ff + i0 ;
223 i0 = n2n3c * j + n3c * k ;
224 double* cf0 = cf + i0 ;
231 for (i=1; i<nr; i++) cf0[i] = x[i] * ff0[i] ;
239 double fmoins0 = 0.5 * ( cf0[nm1] - cf0[0] );
243 for ( i = 1; i < nm1s2 ; i++ ) {
249 int ixsym = nm1 - isym ;
252 double fp = 0.5 * ( cf0[ix] + cf0[ixsym] ) ;
254 double fms = 0.5 * ( cf0[ix] - cf0[ixsym] ) * sinp[i] ;
255 g.set(i) = fp + fms ;
256 g.set(isym) = fp - fms ;
259 g.set(0) = 0.5 * ( cf0[nm1] + cf0[0] );
260 g.set(nm1s2) = cf0[nm1s2];
274 double fac = 2./double(nm1) ;
275 cf0[0] = g(0) / double(nm1) ;
276 for (i=2; i<nm1; i += 2 ) cf0[i] = fac * g(i/2) ;
277 cf0[nm1] = g(nm1s2) / double(nm1) ;
288 for ( i = 3; i < nr; i += 2 ) {
289 cf0[i] = cf0[i-2] + fac * g(nm1 - i/2) ;
294 double c1 = ( fmoins0 - som ) / nm1s2 ;
298 for ( i = 3; i < nr; i += 2 ) cf0[i] += c1 ;
304 for (i=1; i<nm1; i++) {
305 cf0[i] = 2 * cf0[i] - cf0[i-1] ;