data structure for an NFFT (nonequispaced fast Fourier transform) plan with float precision
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#include <nfft3.h>
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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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fftwf_complex * | f_hat |
| Fourier coefficients.
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fftwf_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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float * | sigma |
| Oversampling factor.
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NFFT_INT * | n |
| Length of FFTW transforms. More...
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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. More...
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float * | b |
| Shape parameter for window function.
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NFFT_INT | K |
| Number of equispaced samples of window function. More...
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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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float * | x |
| Nodes in time/spatial domain, size is floats.
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float | MEASURE_TIME_t [3] |
| Measured time for each step if MEASURE_TIME is set.
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float ** | c_phi_inv |
| Precomputed data for the diagonal matrix , size is doubles.
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float * | 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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fftwf_complex * | g |
| Oversampled vector of samples, size is n_total double complex.
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fftwf_complex * | g_hat |
| Zero-padded vector of Fourier coefficients, size is n_total fftw_complex.
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fftwf_complex * | g1 |
| Input of fftw.
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fftwf_complex * | g2 |
| Output of fftw.
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float * | 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 float precision
Definition at line 179 of file nfft3.h.
Length of FFTW transforms.
This is equal to sigma*N. The default is to use a power of two that satifies
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Definition at line 179 of file nfft3.h.
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 179 of file nfft3.h.
Number of equispaced samples of window function.
Used for flag PRE_LIN_PSI.
Definition at line 179 of file nfft3.h.
The documentation for this struct was generated from the following file: