Extract from a matrix pairs of consecutive values

Throughout the following code i can represent random numbers. The problem is that i must be able now, not to plot the array and all the values, rather than that, plot with the scatter functin the pairs of consecutive values, but i dont know how to extract all the pairs. Here is the code i have:

clc;

clear all;

a= 37;

b= 1;

m=64;

f= @(x) mod((a*x)+b, m);

x(1)=1;

for i=1:200

x(i+1)= f(x(i));

end

d=0;

for i=1:200

if x(i+1)==x(1)

d=i;

break;

end

end

d

[Florian Rössing]

Like you want to plot [x(i),x(i+1)] for all i, or just for odd/even i?

Answer 1

[Florian Rössing]

I would suggest

clc;
clear all;
a= 37;
b= 1;
m=64;
f= @(x) mod((a*x)+b, m);
x(1)=1;
for i=1:200
    x(i+1)= f(x(i));
end
d=0;
for i=1:200
    if x(i+1)==x(1)
        d=i;
        break;
    end
end

% if you need the odd vs even
x_odd = x(1:2:end);
x_even = x(2:2:end);

%% if x is of odd length, there are more odd indexed numbers, we need to get rid of one.
if mod(length(x),2)~=0
    x_odd=x_odd(1:end-1);
end


scatter(x_odd,x_even);

%if you want all x(i)
scatter(x(1:end-1),x(2:end)) %  maybe needs some tweaking when the length of x cant be nicely split