jvs:fscan:manual:chapter2:expression:fft
fScan Reference Manual, Chapter 2 (CmdLineOptions:Expr): fft
fft -- Perform a fast Fourier transform
usage: -expr fft flag [outwdsiz]
The FFT expression performs a fast Fourier transform (FFT) on an entire data set. The FLAG argument controls options as:
FLAG:
- 1 - frequency space to image space (default: image to frequency)1-dimensional FFT
- 2 - 2-dimensional FFT (default: 1-dimensional FFT)
- 4 - input has phase (default: magnitude only, set phase to 0)
- 8 - output is complex (default: single value, magnitude only)
- 16 - output is phase only
- 32 - output is real only
- 48 - output is imaginary only
- 64 - magnitude and phase are highest dimension (default: lowest dimension)
OUTWDSIZ is the output word size. The default is float32 if FLAG indicates single values ((FLAG&56)!=8), or cpx_float32 if (FLAG&56)==8.
See Also:
fScan Home,
fScan Manual,
CmdLineOptions,
Expression Command,
Manual Help
jvs/fscan/manual/chapter2/expression/fft.txt · Last modified: 2024/06/21 15:44 by 127.0.0.1