How to store the value of y in the loop being executed?

I'm making a code and I don't know how to get the values that are being made inside the loop.

How do I see what the y results are?

Can anybody help me ?

% BPSK
M = 2;                                      

% number of bits or symbols
N = 10^4;                                 

% Generates random bits
Bits_ale = randi([0 M-1],N,1)>0.5;          

% BPSK modulation 0 -> -1; 1 -> 1
s = 2 * Bits_ale-1;                       

% Generates random watermark bits
Bit_wat = randi([0 M-1],N,1)>0.5;

for k=1:N 
        if Bit_wat ==1
         y = s * exp(1i * pi/4);     
    
                else if Bit_wat ==0
                y = s * exp(1i *(- pi/4));
       
                end
        end
end

Answer 1

[KSSV]

This is how you save y but you need to check your logic.

% BPSK
M = 2;                                      

% number of bits or symbols
N = 10^4;                                 

% Generates random bits
Bits_ale = randi([0 M-1],N,1)>0.5;          

% BPSK modulation 0 -> -1; 1 -> 1
s = 2 * Bits_ale-1;                       
% Generates random watermark bits
Bit_wat = randi([0 M-1],N,1)>0.5;
y = zeros(1,N) ; 
for k=1:N 
   if Bit_wat ==1
      y(k) = s * exp(1i * pi/4);     
   elseif Bit_wat ==0
      y(k) = s * exp(1i *(- pi/4));
    end
end

[adriane duarte]

Thank you KSSV.

I did it this way but the u only stores zeros.

It does not store the values of the loop.

Thank you very much for your attention.

then can I take another question?

[KSSV]

It is because, if-else condition is never executed and the intialized y is as it is. Thats why I said you need to think of your code. You should follow like below:

% BPSK
M = 2;                                      

% number of bits or symbols
N = 10^4;                                 

% Generates random bits
Bits_ale = randi([0 M-1],N,1)>0.5;          

% BPSK modulation 0 -> -1; 1 -> 1
s = 2 * Bits_ale-1;                       
% Generates random watermark bits
Bit_wat = randi([0 M-1],N,1)>0.5;
y = zeros(N,1) ; 
y(Bit_wat==1) = s(Bit_wat==1) * exp(1i * pi/4);  
y(Bit_wat==0) = s(Bit_wat==0) * exp(1i * -pi/4);  

Answer 2

[Tamir Suliman]

i think yo have so many end after the if statement I modified the number of bits per just to speed it up

clc
% BPSK
M = 2;                                      
% number of bits or symbols
% N = 10^4;   
N = 10^1;
% Generates random bits
Bits_ale = randi([0 M-1],N,1)>0.5;       
% BPSK modulation 0 -> -1; 1 -> 1
s = 2 * Bits_ale-1;                       
% Generates random watermark bits
Bit_wat = randi([0 M-1],N,1)>0.5;
for k=1:N 
        if (Bit_wat ==1)
         y = s * exp(1i * pi/4);     
    
        else (Bit_wat ==0)
               y = s * exp(1i *(- pi/4));
       
               
        end
end
y

[adriane duarte]

Thank you Tamir Suliman !!!

the "y" stored the loop values.

can i take another doubt?

[Tamir Suliman]

please accept the answer