You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ft_preproc_bandpassfilter.m
    path of file: ./repos/bspm/thirdparty/MRtools_2015-08-21/Utilities
    
    the code of the file until where you have to start completion: function [filt] = ft_preproc_bandpassfilter(dat,Fs,Fbp,N,type,dir,instabilityfix)

% FT_PREPROC_BANDPASSFILTER applies a band-pass filter to the data and thereby
% removes the spectral components in the data except for the ones in the
% specified frequency band.
%
% Use as
%   [filt] = ft_preproc_bandpassfilter(dat, Fsample, Fbp, N, type, dir, instabilityfix)
% where

    
function [filt] = ft_preproc_bandpassfilter(dat,Fs,Fbp,N,type,dir,instabilityfix)

% FT_PREPROC_BANDPASSFILTER applies a band-pass filter to the data and thereby
% removes the spectral components in the data except for the ones in the
% specified frequency band.
%
% Use as
%   [filt] = ft_preproc_bandpassfilter(dat, Fsample, Fbp, N, type, dir, instabilityfix)
% where
%   dat        data matrix (Nchans X Ntime)
%   Fsample    sampling frequency in Hz
%   Fbp        frequency band, specified as [Fhp Flp]
%   N          optional filter order, default is 4 (but) or depend