% PURPOSE  : 	Remove linear trends from each bin of an ERPset
% 
% FORMAT   : 
% 
% >> ERP = pop_erplindetrend( ERP, interval );
% 
% EXAMPLE  :
% 
% >>ERP = pop_erplindetrend( ERP, 'post');
% >>ERP = pop_erplindetrend( ERP, '0 798');
% >>ERP = pop_erplindetrend( ERP, [0 798]);
% 
% INPUTS   :
% 
% ERP           - input ERPset
% Interval      - time window to estimate the trend. This trend will be 
%                 subtracted from the whole epoch. 'pre'- [-200 0], 
%                 'post'-[0 798], 'whole'-[-200 798] 
% 
% OUTPUTS  :
% 
% ERP           - (updated) output ERPset
%
% GUI: blcerpGUI.m ; SUBROUTINE: lindetrend.m
%
% *** This function is part of ERPLAB Toolbox ***
% Author: Javier Lopez-Calderon
% Center for Mind and Brain
% University of California, Davis,
% Davis, CA
% 2009

%b8d3721ed219e65100184c6b95db209bb8d3721ed219e65100184c6b95db209b
%
% ERPLAB Toolbox
% Copyright © 2007 The Regents of the University of California
% Created by Javier Lopez-Calderon and Steven Luck
% Center for Mind and Brain, University of California, Davis,
% javlopez@ucdavis.edu, sjluck@ucdavis.edu
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program.  If not, see <http://www.gnu.org/licenses/>.

function [ERP erpcom] = pop_erplindetrend( ERP, interval)

erpcom = '';
if nargin < 1
        help pop_lindetrend
        return
end
if isempty(ERP)
        msgboxText =  'No ERPset was found!';
        title_msg  = 'ERPLAB: pop_erplindetrend() error:';
        errorfound(msgboxText, title_msg);
        return
end

%
% Gui is working...
%
if nargin <2      
      titlegui = 'Linear Detrend';
      answer = blcerpGUI(ERP, titlegui );  % open GUI      
      if isempty(answer)
            disp('User selected Cancel')
            return
      end      
      interval = answer{1};
end
if ischar(interval)
      if ~strcmpi(interval,'all') && ~strcmpi(interval,'pre') && ~strcmpi(interval,'post')            
            internum = str2num(interval);            
            if length(internum)~=2
                  msgboxText = 'Wrong interval. Linear detrending will not be performed.';
                  title = 'ERPLAB: pop_erplindetrend() error';
                  errorfound(msgboxText, title);
                  return
            end
            intervalstr = ['[ ' num2str(internum) ' ]'];
      else
            intervalstr = ['''' interval ''''];
      end
else
      if length(interval)~=2
            msgboxText = 'Wrong interval. Linear detrending will not be performed.';
            title = 'ERPLAB: pop_erplindetrend() error';
            errorfound(msgboxText, title);
            return
      end
      intervalstr = ['[ ' num2str(interval) ' ]'];
end

ERPaux = ERP;
ERP = lindetrend( ERP, interval);

%
% Completion statement
%
msg2end

ERP.erpname = [ERP.erpname '_ld']; % suggested name (si queris no mas!)
ERP.saved   = 'no';

if nargin==1
      [ERP issave erpcom_save] = pop_savemyerp(ERP,'gui','erplab');
      if issave>0
            erpcom = sprintf( '%s = pop_erplindetrend( %s, %s );', inputname(1), inputname(1), intervalstr);
            if issave==2
                  erpcom = sprintf('%s\n%s', erpcom, erpcom_save);
                  msgwrng = '*** Your ERPset was saved on your hard drive.***';
                  mcolor = [0 0 1];
            else
                  msgwrng = '*** Warning: Your ERPset was only saved on the workspace.***';
                  mcolor = [1 0.52 0.2];
            end
      else
            ERP = ERPaux;
            msgwrng = 'ERPLAB Warning: Your changes were not saved';
            mcolor = [1 0.22 0.2];
      end
      try cprintf(mcolor, '%s\n\n', msgwrng);catch,fprintf('%s\n\n', msgwrng);end ;
end
return

