Usage: 1dfft [options] infile outfile where infile is an AFNI *.1D file (ASCII list of numbers arranged in columns); outfile will be a similar file, with the absolute value of the FFT of the input columns. The length of the file will be 1+(FFT length)/2.
Options:
- -ignore sss = Skip the first ‘sss’ lines in the input file.
- [default = no skipping]
- -use uuu = Use only ‘uuu’ lines of the input file.
- [default = use them all, Frank]
- -nfft nnn = Set FFT length to ‘nnn’.
- [default = length of data (# of lines used)]
-tocx = Save Re and Im parts of transform in 2 columns.
- -fromcx = Convert 2 column complex input into 1 column
- real output.
- -hilbert = When -fromcx is used, the inverse FFT will
- do the Hilbert transform instead.
-nodetrend = Skip the detrending of the input.
form ‘a+b*t+c*t*t’ removed before the FFT, where ‘t’ is the line number.
factor of 3 and one factor of 5. The smallest such length >= to the specified FFT length will be used.
data is zero-padded to make up the difference.
That is something else entirely.
If ‘outfile’ is ‘-‘, the output appears on stdout.
++ Compile date = Dec 16 2015
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