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: arIntStepPPL.m
    path of file: ./repos/d2d/arFramework3/PPL
    
    the code of the file until where you have to start completion: % [dps, dx_out, gamma_tmp] = arIntStepPPL(t_tmp, general_struct, stepsize, gamma_tmp)
% 
% t_tmp
% ppl_general_struct    PPL result struct
%                       model index, condition index etc are taken from
%                       this struct
% stepsize
% gamma_tmp
% 
% dps
% dx_out
% gamma_tmp
% 
% This function calls arPPL_GetChi2
% 
% Written by Helge, trie
    
function calls arPPL_GetChi2
% 
% Written by Helge, tried to be documented by Clemens.

function [dps, dx_out, gamma_tmp] = arIntStepPPL(t_tmp, general_struct, stepsize, gamma_tmp)
global ar;

m=general_struct.m;
c=general_struct.c;
jx=general_struct.jx; 
takeY=general_struct.takeY;
qLog10 = ar.ppl.qLog10;
xstd = ar.ppl.options.xstd;
%only needed if RK4 is chosen
xFit_tmp = ar.ppl.xFit_tmp;
p_tmp = general_struct.pReset;

[grad, H, dy_pred, xSim, grad_y, fRHS] = get_stuff(t_tmp,stepsize);
dx_0 = get_int();
region_fac_p = get_fac(dx_0(2:end