84char citsin_C[] =
"$Header: /cvsroot/Lorene/C++/Source/Non_class_members/Coef/FFTW3/citsin.C,v 1.3 2014/10/13 08:53:21 j_novak Exp $" ;
120fftw_plan back_fft(
int, Tbl*&) ;
121double* cheb_ini(
const int) ;
124void citsin(
const int* deg,
const int* dimc,
double* cf,
const int* dimf,
143 cout <<
"citcos: nt > n2f : nt = " << nt <<
" , n2f = "
149 cout <<
"citcos: nt > n2c : nt = " << nt <<
" , n2c = "
154 if ( (n1f > 1) && (n1c > n1f) ) {
155 cout <<
"citcos: n1c > n1f : n1c = " << n1c <<
" , n1f = "
161 cout <<
"citcos: n3c > n3f : n3c = " << n3c <<
" , n3f = "
173 fftw_plan p = back_fft(nm1, pg) ;
177 double* sinp = cheb_ini(nt);
182 int n2n3f = n2f * n3f ;
183 int n2n3c = n2c * n3c ;
191 int borne_phi = n1c-1 ;
192 if (n1f == 1) borne_phi = 1 ;
194 for (j=0; j< borne_phi; j++) {
198 for (k=0; k<n3c; k++) {
200 int i0 = n2n3c * j + k ;
201 double* cf0 = cf + i0 ;
204 double* ff0 = ff + i0 ;
209 for (i=2; i<nm1; i += 2 ) g.set(nm1-i/2) = -0.5 * cf0[ n3c*i ] ;
214 g.set(0) = .5 * cf0[n3c] ;
215 for ( i = 3; i < nt; i += 2 ) {
216 g.set(i/2) = .25 * ( cf0[ n3c*i ] - cf0[ n3c*(i-2) ] ) ;
218 g.set(nm1s2) = - .5 * cf0[ n3c*(nt-2) ] ;
229 for ( i = 1; i < nm1s2 ; i++ ) {
233 double fp = 0.5 * ( g(i) + g(isym) ) / sinp[i] ;
234 double fm = 0.5 * ( g(i) - g(isym) ) ;
235 ff0[ n3f*i ] = fp + fm ;
236 ff0[ n3f*isym ] = fp - fm ;
241 ff0[ n3f*nm1 ] = -2*g(0) ;
242 ff0[ n3f*nm1s2 ] = g(nm1s2) ;