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package fftw3
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Module Fftw3.DSource
Double precision FFTW.
Precision
Precision of float numbers.
Precision of complex numbers.
Float of the precision of this module. Use this to create precision independent code.
Complex of the precision of this module. Use this to create precision independent code.
Specifying plans
FFTW plan.
c2c plan usual discrete Fourier transform, from complex to complex
r2c plan real to complex transform
c2r plan complex to real transform
r2r plan real to real transform
Direction of the transform — see the FFTW manual.
Source
type measure = | Estimate(*No measurements are made, use a simple heuristic to pick a (probably sub-optimal) plan quickly.
*)| Measure(*Find an optimized plan by actually computing several FFTs and measuring their execution time.
*)| Patient(*Like
*)Measure, but considers a wider range of algorithms and often produces a "more optimal" plan at the expense of several times longer planning time.| Exhaustive(*Like
*)Patient, but considers an even wider range of algorithms, including many that are thought unlikely to be fast, to produce the most optimal plan but with a substantially increased planning time.
Planning-rigor flags.
Source
type r2r_kind = | R2HC(*real to halfcomplex
*)| HC2R(*halfcomplex to real
*)| DHT(*discrete Hartley Transform
*)| REDFT00(*real-even DFT: even around j=0 and even around j=n-1
*)| REDFT01(*real-even DFT: even around j=0 and odd around j=n
*)| REDFT10(*real-even DFT: even around j=-0.5 and even around j=n-0.5
*)| REDFT11(*real-even DFT: even around j=-0.5 and odd around j=n-0.5
*)| RODFT00(*real-odd DFT; odd around j=-1 and odd around j=n
*)| RODFT01(*real-odd DFT; odd around j=-1 and even around j=n-1
*)| RODFT10(*real-odd DFT; odd around j=-0.5 and odd around j=n-0.5
*)| RODFT11(*real-odd DFT; odd around j=-0.5 and even around j=n-0.5
*)
Real-to-Real transform kinds. The real-even (resp. real-odd) DFT are somtimes called Discrete Cosine Transform (DCT) (resp. Discrete Sine Transform (DST)). Note that the explanations of the various transforms are for an input array of dimension n and C layout (i.e. the input array is input[0..n-1]). The logical size N is N=2(n-1) for REDFT00, N=2(n+1) for RODFT00, and N=2n otherwise. See the FFTW manual for more details.
Exception raised to indicate that a plan could not be created.
Executing plans
exec plan executes the plan on the arrays given at the creation of this plan. This is the normal way to execute any kind of plan.
This function is thread safe (and may run the actual computation on a different core than the main program).
Creating plans
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