data structure for an NFFT (nonequispaced fast Fourier transform) plan with long double precision
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Public Member Functions |
| FFTW_MANGLE_LONG_DOUBLE (plan) my_fftw_plan1 |
| Forward FFTW plan.
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| FFTW_MANGLE_LONG_DOUBLE (plan) my_fftw_plan2 |
| Backward FFTW plan.
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Data Fields |
NFFT_INT | N_total |
| Total number of Fourier coefficients.
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NFFT_INT | M_total |
| Total number of samples.
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fftwl_complex * | f_hat |
| Fourier coefficients.
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fftwl_complex * | f |
| Samples.
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void(* | mv_trafo )(void *) |
| Transform.
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void(* | mv_adjoint )(void *) |
| Adjoint transform.
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NFFT_INT | d |
| Dimension (rank).
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NFFT_INT * | N |
| Multi-bandwidth.
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long double * | sigma |
| Oversampling factor.
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NFFT_INT * | n |
| Length of FFTW transforms.
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NFFT_INT | n_total |
| Combined total length of FFTW transforms.
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NFFT_INT | m |
| Cut-off parameter for window function.
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long double * | b |
| Shape parameter for window function.
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NFFT_INT | K |
| Number of equispaced samples of window function.
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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.
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unsigned | fftw_flags |
| Flags for the FFTW, default is FFTW_ESTIMATE | FFTW_DESTROY_INPUT.
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long double * | x |
| Nodes in time/spatial domain, size is long doubles.
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long double | MEASURE_TIME_t [3] |
| Measured time for each step if MEASURE_TIME is set.
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long double ** | c_phi_inv |
| Precomputed data for the diagonal matrix , size \ is doubles.
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long double * | psi |
| Precomputed data for the sparse matrix , size depends on precomputation scheme.
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NFFT_INT * | psi_index_g |
| Indices in source/target vector for PRE_FULL_PSI.
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NFFT_INT * | psi_index_f |
| Indices in source/target vector for PRE_FULL_PSI.
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fftwl_complex * | g |
| Oversampled vector of samples, size is n_total double complex.
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fftwl_complex * | g_hat |
| Zero-padded vector of Fourier coefficients, size is n_total fftw_complex.
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fftwl_complex * | g1 |
| Input of fftw.
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fftwl_complex * | g2 |
| Output of fftw.
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long double * | spline_coeffs |
| Input for de Boor algorithm if B_SPLINE or SINC_POWER is defined.
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NFFT_INT * | index_x |
| Index array for nodes x used when flag NFFT_SORT_NODES is set.
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data structure for an NFFT (nonequispaced fast Fourier transform) plan with long double precision
Definition at line 178 of file nfft3.h.