I am not getting unique random numbers from henon map??please help in this

my code is here

if true
  % code
N=16;
a=1.4;
b=0.3;
x=zeros(1,N);
y=zeros(1,N);
x(1)=0.63154*(10^(-11));
y(1)=0.18906*(10^(-11));
for i=1:N
x(i+1)=1+y(i)-a*((x(i))^2);
y(i+1)=b*x(i);
end
plot(x,y)
for j=0:(N/2)-1
q(2*j+1)=x(j+1);
q(2*j+2)=y(j+1);
end
d=floor(q*(10^15));
s=mod(d,N);
end

Answer 1

[the cyclist]

Are you sure you have a problem with your code? I increased N to 16000, and plotted your data. It sure looks like a Hénon attractor to me.

[the cyclist]

Oh, I see now. Try

plot(x,y,'.')

instead of

plot(x,y)

You don't want the connecting lines.

[VINAY KUMAR SHARMA]

sir I am also getting correct henon map, but problem is to convert it in chaotic sequence. in variable s I am getting repeating values, how can I get unique no.

[the cyclist]

Can you add some more detail? I don't understand why you expect non-repeating values in s, so it is not possible for me to help you.

Are you trying to produce pseudorandom numbers from the Hénon map? (Numbers if pseudorandom sequences can repeat. Just not in a predictable way, ideally.)

Do you have some reference? Are you trying replicate some results from a paper or a textbook?

It might be that your code is mathematically correct, but there are nuances with doing floating point math.

[VINAY KUMAR SHARMA]

I want to scramble the pixels of an image, by generating random numbers from henon map, I want to create indexing. if i have repeating values I cant decrypt image again.