tent map for image scrambling

clc;clear;close all;

N=200;

xp=zeros(1,N);

Aa=ones(1,N);

hold on;box on;

x=0.34;

for a=0:.001:1;

for n=1:N;

x=a-(1+a)*abs(x);

end

for k=1:N;

x=a-(a+1)*abs(x);

xp(k)=x;

end

plot(Aa*a,xp,'k.','markersize',1);

end

xlim([0,a]);

xlabel('\ita','Fontsize',22,'Fontname','Times new roman');

set(gcf,'Color','w');

how to use this code for image scrambling ????please help me...