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: gipc.m
    path of file: ./repos/bspm/thirdparty/MIALAB/gipc1d
    
    the code of the file until where you have to start completion: function varargout = gipc(varargin)
% GIPC M-file for gipc.fig
%      GIPC, by itself, creates a new GIPC or raises the existing
%      singleton*.
%
%      H = GIPC returns the handle to a new GIPC or the handle to
%      the existing singleton*.
%
%      GIPC('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named
    
function pbPathGrp2_Callback(hObject, eventdata, handles)
    % Loads list of files manually for grp 2
    global gSave;
    [gSave.files2, designMatrix, gSave.numOfSub2, gSave.numOfSess2, dataSelMethod, gSave.diffTimePoints2, spmMatFlag] = ipctb_ica_dataSelection([], get(handles.stPathGrp1, 'String'), '', ['R_', 'I_'], 'real&imaginary');

    if length(deblank(gSave.files2(1,1).name(1,:))) <= 0
        % user never chose a file
        gSave.files2 = [];
        return
    end