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: DEM_demo_MDP_reading.m
    path of file: ./repos/bspm/thirdparty/spm12/toolbox/DEM
    
    the code of the file until where you have to start completion: function MDP = DEM_demo_MDP_reading
% Demo of active inference for visual salience
%__________________________________________________________________________
%
% This routine provide simulations of reading to demonstrate deep temporal
% generative models. It builds upon the scene construction simulations to
% equip the generative model with a second hierarchical level. In effect,
% this creates an agent that can accumulate evidence at the second level
% based upon
    
function spm_MDP_search_percept(MDP)
% illustrates visual expectations with a movie
%--------------------------------------------------------------------------
clf;
subplot(4,1,1), spm_MDP_search_plot(MDP)
axis image ij, axis([2 14 -2 2]),
subplot(4,1,2)
axis image ij, axis([2 14 -2 2]), hold on
 
% locations on page and of page
%--------------------------------------------------------------------------
x = [0 0;0 1;1 0;1 1];
y = [1 0;2 0;3 0;4 0]*3;
r = [-1,1]/2;
s = r*(1 + 1/4);
 
 
% load images
%--------------------------------------------------------------------------
load MDP_search_graphics
null = zeros(size(bird)) + 1;
 
mdp = MDP.mdp(1);
try
    d = mdp.D;
catch
    d = mdp.d;
end