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NFFT
3.5.0
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data structure for an NFFT (nonequispaced fast Fourier transform) plan with double precision More...
#include <nfft3.h>
Public Member Functions | |
| FFTW_MANGLE_DOUBLE (plan) my_fftw_plan1 | |
| Forward FFTW plan. | |
| FFTW_MANGLE_DOUBLE (plan) my_fftw_plan2 | |
| Backward FFTW plan. | |
Data Fields | |
| NFFT_INT | N_total |
| Total number of Fourier coefficients. More... | |
| NFFT_INT | M_total |
| Total number of samples. More... | |
| fftw_complex * | f_hat |
| Fourier coefficients. More... | |
| fftw_complex * | f |
| Samples. More... | |
| void(* | mv_trafo )(void *) |
| Transform. More... | |
| void(* | mv_adjoint )(void *) |
| Adjoint transform. More... | |
| NFFT_INT | d |
| Dimension (rank). More... | |
| NFFT_INT * | N |
| Multi-bandwidth. More... | |
| double * | sigma |
| Oversampling factor. More... | |
| NFFT_INT * | n |
| Length of FFTW transforms. More... | |
| NFFT_INT | n_total |
| Combined total length of FFTW transforms. More... | |
| NFFT_INT | m |
| Cut-off parameter for window function. More... | |
| double * | b |
| Shape parameter for window function. | |
| NFFT_INT | K |
| Number of equispaced samples of window function. More... | |
| unsigned | flags |
| Flags for precomputation, (de)allocation, and FFTW usage, default setting is PRE_PHI_HUT | PRE_PSI | MALLOC_X | MALLOC_F_HAT | MALLOC_F | FFTW_INIT | FFT_OUT_OF_PLACE. | |
| unsigned | fftw_flags |
| Flags for the FFTW, default is FFTW_ESTIMATE | FFTW_DESTROY_INPUT. | |
| double * | x |
Nodes in time/spatial domain, size is doubles. | |
| double | MEASURE_TIME_t [3] |
| Measured time for each step if MEASURE_TIME is set. | |
| double ** | c_phi_inv |
Precomputed data for the diagonal matrix , size \ is doubles. | |
| double * | psi |
Precomputed data for the sparse matrix , size depends on precomputation scheme. | |
| NFFT_INT * | psi_index_g |
| Indices in source/target vector for PRE_FULL_PSI. | |
| NFFT_INT * | psi_index_f |
| Indices in source/target vector for PRE_FULL_PSI. | |
| fftw_complex * | g |
| Oversampled vector of samples, size is n_total double complex. | |
| fftw_complex * | g_hat |
| Zero-padded vector of Fourier coefficients, size is n_total fftw_complex. | |
| fftw_complex * | g1 |
| Input of fftw. | |
| fftw_complex * | g2 |
| Output of fftw. | |
| double * | spline_coeffs |
| Input for de Boor algorithm if B_SPLINE or SINC_POWER is defined. | |
| NFFT_INT * | index_x |
| Index array for nodes x used when flag NFFT_SORT_NODES is set. More... | |
data structure for an NFFT (nonequispaced fast Fourier transform) plan with double precision
NFFT transform plan
| NFFT_INT nfft_plan::N_total |
Total number of Fourier coefficients.
Definition at line 192 of file nfft3.h.
Referenced by mri_inh_2d1d_init_guru(), nfsoft_trafo(), nsfft_cp(), nsfft_init_random_nodes_coeffs(), and reconstruct().
| NFFT_INT nfft_plan::M_total |
Total number of samples.
Definition at line 192 of file nfft3.h.
Referenced by construct(), mri_inh_2d1d_init_guru(), mri_inh_3d_adjoint(), nfsoft_precompute(), and reconstruct().
| fftw_complex* nfft_plan::f_hat |
Fourier coefficients.
Definition at line 192 of file nfft3.h.
Referenced by construct(), mri_inh_2d1d_finalize(), mri_inh_2d1d_init_guru(), mri_inh_2d1d_trafo(), mri_inh_3d_adjoint(), mri_inh_3d_trafo(), nfsft_adjoint(), nfsft_init_advanced(), nfsft_trafo(), nfsoft_adjoint(), nfsoft_init_guru_advanced(), nfsoft_trafo(), nnfft_precompute_full_psi(), nsfft_cp(), nsfft_init_random_nodes_coeffs(), and reconstruct().
| fftw_complex* nfft_plan::f |
Samples.
Definition at line 192 of file nfft3.h.
Referenced by construct(), mri_inh_2d1d_finalize(), mri_inh_2d1d_init_guru(), mri_inh_2d1d_trafo(), mri_inh_3d_adjoint(), mri_inh_3d_trafo(), nfsft_adjoint(), nfsft_init_advanced(), nfsft_trafo(), nfsoft_adjoint(), nfsoft_trafo(), nnfft_adjoint(), nnfft_precompute_full_psi(), nnfft_trafo(), nsfft_init_random_nodes_coeffs(), and reconstruct().
| NFFT_INT* nfft_plan::N |
Multi-bandwidth.
Definition at line 192 of file nfft3.h.
Referenced by nsfft_cp(), and nsfft_init_random_nodes_coeffs().
| NFFT_INT* nfft_plan::n |
Length of FFTW transforms.
This is equal to sigma*N. The default is to use a power of two that satifies
.
Definition at line 192 of file nfft3.h.
Referenced by nsfft_init_random_nodes_coeffs().
| NFFT_INT nfft_plan::n_total |
Combined total length of FFTW transforms.
Definition at line 192 of file nfft3.h.
Referenced by nsfft_init_random_nodes_coeffs().
| NFFT_INT nfft_plan::m |
Cut-off parameter for window function.
Default values for the different window functions are - 6 (KAISER_BESSEL), - 9 (SINC_POWER), - 11 (B_SPLINE), - 12 (GAUSSIAN)
Definition at line 192 of file nfft3.h.
Referenced by mri_inh_2d1d_trafo(), mri_inh_3d_adjoint(), mri_inh_3d_trafo(), nsfft_init(), and nsfft_init_random_nodes_coeffs().
| NFFT_INT nfft_plan::K |
Number of equispaced samples of window function.
Used for flag PRE_LIN_PSI.
Definition at line 192 of file nfft3.h.
Referenced by nsfft_adjoint().
| NFFT_INT* nfft_plan::index_x |
1.8.11