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fMRItools (version 0.7.2)

dct_convert: DCT and frequency conversion

Description

Convert between number of DCT bases and Hz of highpass filter

Usage

dct_convert(T_, TR, n = NULL, f = NULL)
dct2Hz(T_, TR, n)
Hz2dct(T_, TR, f)

Value

If n was provided, the highpass filter cutoff (Hz) is returned. Otherwise, if f was provided, the number of cosine bases is returned. The result should be rounded before passing to dct_bases

Arguments

T_

Length of timeseries (number of timepoints)

TR

TR of the fMRI scan, in seconds (the time between timepoints)

n

Number of cosine bases

f

Hz of highpass filter

Details

Provide either n or f to calculate the other.

If only the total length of the scan is known, you can set that to TR and use T_=1.

\(f = n / (2 * T_ * TR)\)