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: spm_filter.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8
    
    the code of the file until where you have to start completion: function varargout = spm_filter(K,Y)
% Removes low frequency confounds X0
% FORMAT [Y] = spm_filter(K,Y)
% FORMAT [K] = spm_filter(K)
%
% K           - filter matrix or:
% K(s)        - struct array containing partition-specific specifications
%
% K(s).RT     - observation interval in seconds
% K(s).row    - row of Y constituting block/partition s
% K(s).HParam - cut-off period in seconds
%
% K(s).X0     - low frequencies to be removed (DCT)
%
% Y           - data matrix
%
% K           - filter structure
% Y           - filtered data
%__________________________________________________________________________
%

    
function varargout = spm_filter(K,Y)
% Removes low frequency confounds X0
% FORMAT [Y] = spm_filter(K,Y)
% FORMAT [K] = spm_filter(K)
%
% K           - filter matrix or:
% K(s)        - struct array containing partition-specific specifications
%
% K(s).RT     - observation interval in seconds
% K(s).row    - row of Y constituting block/partition s
% K(s).HParam - cut-off period in seconds
%
% K(s).X0     - low frequencies to be removed (DCT)
%
% Y           - data matrix
%
% K           - filter structure
% Y           - filtered data
%__________________________________________________________________________
%
% spm_filter implements high-pass filtering in an efficient way by
% using the residual forming matrix of X0 - low frequency confounds
%.spm_filter also configures the filter structure in accord with the
% specification fields if called with one argument
%__________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Karl Friston
% $Id: spm_filter.m 4191 2011-02-03 13:30:02Z guillaume $


%-Configure filter
%==========================================================================
if nargin == 1 && isstruct(K)
    
    % set K.X0
    %----------------------------------------------------------------------
    for s = 1:length(K)
        
        % make high pass filter
        %------------------------------------------------------------------
        k       = length(K(s).row);
        n       = fix(2*(k*K(s).RT)/K(s).HParam + 1);
        X0      = spm_dctmtx(k,n);
        K(s).X0 = X0(:,2:end