custom_filter: Custom filtering.
In craddm/firfiltR: FIR filtering

This function supports use of different transition bandwidths for low- and high-pass cutoffs respectively. Note that since it is intended to be used carefully, it has few defaults.

1 2	custom_filter(data, f, tbw = NULL, win_type = "hamming", beta = NULL, pb_dev = 2e-04, type, srate = NULL)

`data`	Data to be filtered. Wide format expected.
`f`	Cutoff frequency/ies
`tbw`	Transition bandwidth(s).
`win_type`	Window type.
`beta`	Required if window type is Kaiser
`pb_dev`	Required if window type is Kaiser
`type`	Filtering type - "highpass", "lowpass", "bandpass", "bandstop"
`srate`	Sampling rate (required if data is not of class "eeg_data").