Combining two matrices in the correct original order

I have one matrix of random intergers (x) which I have spilt into two matrices (A) and (B). I have then converted to binary, then manipulated it and I got back the original matrices A and B represented by r and rr.

How can I recombine the matrices r and rr to get back to the original matrix A?

close all; clc; clear all;
%% Generation
x=randi([1,128],128,128);

A=x(1:2:end,1:2:end,:);
a=de2bi(A,8).';
a=a(:);
Na=length(a);

B=x(2:2:end,2:2:end,:);
b=de2bi(B,8).';
b=b(:);
Nb=length(b);

%%% other processing %%%

%% get back original sqeuence 
r=reshape(a,8,[])';
ss=bi2de(r)';
r=reshape(ss,64,64);

rr=reshape(b,8,[])';
s=bi2de(rr)';
rr=reshape(s,64,64);

Answer 1

[David Hill]

x=randi([1,128],128,128);%16,384 elements
A=x(1:2:end,1:2:end,:);%4,096 elements
B=x(2:2:end,2:2:end,:);%4,096 elements

Combining A and B will never give you back x.