iNFFT - Plan

The library defines the structure infft_plan. The members direct_plan and infft_flags are already discussed. Table 5 shows part of the remaining members.

Table 5: More important members of infft_plan.

type	name	description	size (in *type)
double*	w	weights ${w}$	$M$
double*	w_hat	damping factors ${\hat w}$	$N_{\text{\tiny $\Pi$}}$
fftw_complex*	given_f	right hand side	$M$
fftw_complex*	f_hat_iter	actual solution	$N_{\text{\tiny $\Pi$}}$
fftw_complex*	f_hat_iter_2nd	2nd solution (ITERATE_2nd)	$N_{\text{\tiny $\Pi$}}$
fftw_complex*	r_iter	residual vector ${r}$$_{l+1}$	$M$
double	dot_r_iter	$\Vert$${r}$$_{l+1}\Vert _{\mbox{\boldmath\scriptsize {${W}$}}}^2$
double	dot_r_iter_old	$\Vert$${r}$$_{l}\Vert _{\mbox{\boldmath\scriptsize {${W}$}}}^2$