Replace matrix with the other random matrix.

Hello,

Here I have matrix vector 0 and 1 with size (1024, 1), and I have the other matrix from random matrix with value between 0 and 1, with a seed (rng function), so the output of this matrix not change, and length this matrix dependent how much vector 0 and 1 in the first matrix. And I want to replace the first matrix (1024, 1) with the second matrix, but must equal with the vector, 0 or 1. And the output matrix which changed have the value random (between 0 until 1) with size (1024, 1). How can I make it? Thank you.

[Amit]

The question is a bit confusing. Can you rephrase it with an example (probably take the matrix as size (5,1))

[Andi Tarigan]

arnold_new = reshape(arnold, 1024, 1); % Make the matrix to 1 column

find_0 = find(arnold_new == 0); % Total bit 0
find_1 = find(arnold_new == 1); % Total bit 1

size_0 = size(find_0);
size_1 = size(find_1);

% =========================================================================
% Program to generate pseudorandom bit 0
% =========================================================================

rng(0) % Seed for bit 0
null = rand(size_0); % Total random value bit 0
null_new = reshape(nol, length(null_new), 1); % Make matrix to 1 column
% =========================================================================
% Program to generate pseudorandom bit 0
% =========================================================================

rng(1)% Seed for bit 1
one = rand(size_1); % Total random value bit 0
one_new = reshape(one, length(one_new), 1); % Make matrix to 1 column

And how i can changed the arnold_new matrix with the pseudorandom sequence in null_new and one_new? So that output is random, not bit 0 or 1 as arnold_new.

Answer 1

[Amit]

How about simply:

rng(0);
arnold_new_null = rand(size(arnold_new));
rng(1);
arnold_new_ones = rand(size(arnold_new));
arnold_new(arnold_new == 1) = arnold_new_ones(arnold_new == 1);
arnold_new(arnold_new == 0) = arnold_new_nulls(arnold_new == 0);

[Andi Tarigan]

And how about the matrix arnold_new (with bit 0 and 1)? Because I want to replace it, with the arnold_new_null and arnold_new_one.

[Amit]

So If I understand you correctly, you want to replace 1s with random number generated by seed 1 and 0s with random number generated by seed 0.

Check the updated code if thats what you want.

[Andi Tarigan]

Until arnold_new_null and arnold_new_ones are correct. I am sorry, i mean matrix arnold_new replace by seed 1s and 0s, must be matched with arnold_new_null and arnold_new_ones. So, if the first row is bit 0, it will replaced by first row arnold_new_null, and if the second row is bit 1, it will replaced by first row arnold_new_ones. So the total row in arnold_new = arnold_new_null + arnold_new_ones

[Amit]

Okay. That is clear. This will work.

nullVals = find(arnold_new == 0);
onesVals = find(arnold_new == 1);
rng(0);
arnold_new(nullVals) = rand(length(nullVals),1);
rng(1);
arnold_new(onesVals) = rand(length(onesVals),1);

[Andi Tarigan]

It's work, but I must change that to:

rng(0); arnold_new_null = rand(length(nullVals),1); rng(1); arnold_new_one = rand(length(onesVals),1);

And how if I want to make both to 1 column? But with the same sequence,so the size is 1024,1.

[Amit]

rng(0); 
arnold_new_null = rand(1024,1); 
rng(1); 
arnold_new_one = rand(1024,1);

[Andi Tarigan]

Okay. Thankyou sir!

Answer 2

[Azzi Abdelmalek]

Maybe you want this:

a=randi([0 1],1,10);
s=rng;
b=rand(1,10);
out=a.*b

[Andi Tarigan]

Thanks sir, but I must have 2 rng, for bit 0 and bit 1. If the first row in matrix a is 1, it must take a random from matrix b (rng for 1). Same with bit 0, it will take from matrix b (rng for 0). So I can replace matrix a, with matrix b.

[Azzi Abdelmalek]

 a=randi([0 1],1,10);
s1=rng;
b1=rand(1,10);
s2=rng;
b2=rand(1,10);
out=zeros(size(a))
out(a==1)=b1(a==1)
out(a==0)=b2(a==0)

[Andi Tarigan]

It works! Thankyou sir!