23char citcosp_C[] =
"$Header: /cvsroot/Lorene/C++/Source/Non_class_members/Coef/FFTW3/citcosp.C,v 1.3 2014/10/13 08:53:20 j_novak Exp $" ;
133fftw_plan back_fft(
int, Tbl*&) ;
134double* cheb_ini(
const int) ;
137void citcosp(
const int* deg,
const int* dimc,
double* cf,
const int* dimf,
156 cout <<
"citcosp: nt > n2f : nt = " << nt <<
" , n2f = "
162 cout <<
"citcosp: nt > n2c : nt = " << nt <<
" , n2c = "
167 if ( (n1f > 1) && (n1c > n1f) ) {
168 cout <<
"citcosp: n1c > n1f : n1c = " << n1c <<
" , n1f = "
174 cout <<
"citcosp: n3c > n3f : n3c = " << n3c <<
" , n3f = "
186 fftw_plan p = back_fft(nm1, pg) ;
190 double* sinp = cheb_ini(nt);
195 int n2n3f = n2f * n3f ;
196 int n2n3c = n2c * n3c ;
204 int borne_phi = n1c-1 ;
205 if (n1f == 1) borne_phi = 1 ;
207 for (j=0; j< borne_phi; j++) {
211 for (k=0; k<n3c; k++) {
213 int i0 = n2n3c * j + k ;
214 double* cf0 = cf + i0 ;
217 double* ff0 = ff + i0 ;
231 double c1 = cf0[n3c] ;
235 for ( i = 3; i < nt; i += 2 ) {
236 ff0[ n3f*i ] = cf0[ n3c*i ] - c1 ;
237 som += ff0[ n3f*i ] ;
241 double fmoins0 = nm1s2 * c1 + som ;
246 for ( i = 3; i < nt; i += 2 ) {
247 g.set(nm1-i/2) = 0.25 * ( ff0[ n3f*i ] - ff0[ n3f*(i-2) ] ) ;
259 for (i=1; i<nm1s2; i++ ) g.set(i) = 0.5 * cf0[ n3c*2*i ] ;
260 g.set(nm1s2) = cf0[ n3c*nm1 ] ;
271 for ( i = 1; i < nm1s2 ; i++ ) {
275 double fp = 0.5 * ( g(i) + g(isym) ) ;
276 double fm = 0.5 * ( g(i) - g(isym) ) / sinp[i] ;
277 ff0[ n3f*i ] = fp + fm ;
278 ff0[ n3f*isym ] = fp - fm ;
282 ff0[0] = g(0) + fmoins0 ;
283 ff0[ n3f*nm1 ] = g(0) - fmoins0 ;
284 ff0[ n3f*nm1s2 ] = g(nm1s2) ;