Brain Imaging & Analysis Center

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