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: arIntegratePredBand.m
    path of file: ./repos/d2d/arFramework3/PPL
    
    the code of the file until where you have to start completion: % arIntegratePredBand(general_struct, dir)
% 
% ppl_general_struct    PPL result struct
% dir               direction
%                   dir=1 => uncertainty in upper direction
%                   otherwise => uncertainty in lower direction
% 
% Written by Helge, tried to be documented by Clemens.

function arIntegratePredBand(general_struct, dir)
    global ar
        
    %Set temporal variables from global and structs   
    t_tmp = general_struct.t(ar.ppl.options.whichT);
    doPPL = ar.ppl.options.doPPL;
    gamma_tmp = ar.ppl.options.gamma;
    stepsize = ar.ppl.options.stepsize;
    ed_steps = ar.ppl.options.ed_steps;
    pReset= general_struct.pReset;
    backward = ar.ppl.options.backward;
    fineInt = ar.ppl.options.fineInt;
    takeY = general_struct.takeY;
    m = general_struct.m;

    
function arIntegratePredBand(general_struct, dir)
    global ar
        
    %Set temporal variables from global and structs   
    t_tmp = general_struct.t(ar.ppl.options.whichT);
    doPPL = ar.ppl.options.doPPL;
    gamma_tmp = ar.ppl.options.gamma;
    stepsize = ar.ppl.options.stepsize;
    ed_steps = ar.ppl.options.ed_steps;
    pReset= general_struct.pReset;
    backward = ar.ppl.options.backward;
    fineInt = ar.ppl.options.fineInt;
    takeY = general_struct.takeY;
    m = general_struct.m;
    c = general_struct.c;
    jx = general_struct.jx;
    
    npre=0;
    ppl_vpl = general_struct.ppl_vpl;
    data_cond = general_struct.data_cond;
    x_y = general_struct.x_y;    
          
    %Set starting values for pars and position
    if(dir == 1)
        high_low = 'upperBand';
    else
        high_low = 'lowerBand';        
    end
    ar.ppl.xFit_tmp = ar.model(m).(data_cond)(c).ppl.band.(['xs_' ppl_vpl high_low])(1, jx);
    ar.p=squeeze(ar.model(m).(data_cond)(c).ppl.band.(['ps_' high_low])(1, jx,:))';
    if(size(ar.p,1)~=1)
        error('what happened with the parameters?')
    end