Index exceeds the number of array elements (0) (Matlab)

Dear members

I'm working on a program that contains this part

 % Decoding part
VCor_final=decode_irrwbf(Hc,rxn,M,N,max_ite);
    V_final=VCor_final(N+1:end); 
    % Obtaining the initial sequence
    uRec = []; 
    for i = 1
      tmp = reshape(V_final(i,:), 2, length(V_final(i,:))/2);
      uRec = [uRec tmp(1, :)];
      U;
    end 
    % BER
   [n, ber] = biterr(uRec(1:M*L),U);
   ber_sim = [ber_sim ber];
end 
snr = 0:2:30;
figure;
semilogy(snr, ber_sim,'k*-','linewidth',1);
axis([0 30 0.000001 1]);
grid on;
xlabel('SNR(dB)');
ylabel('BER');

When running the program, step by step for the "decode_irrwbf" function it gives results of VCor_final. So it works with this function

But in the main program shows above, when running I got the error (Index exceeds the number of array elements (0)) and in the window command I got them empty

Can anyone tell me the problem and how to solve it please

[Rik]

The problem probably already starts at the first line. Did you try running it separately to confirm the output is non-empty?

[Afluo Raoual]

@Rik Yes I tried to run it separately and I tried to run the function of the first line step by step and it gives results. It's not empty. But when I run this complet program I got this problem.

[Rik]

Then the inputs must be different between the two runs.

Please attach a mat file with enough data to reproduce this issue with your code.

[Walter Roberson]

Put a breakpoint in the code at the first line. Run. "step" . Check to see what size(Vcor_final) is. Continue to "step" until you encounter an error or something you do not expect.

[Afluo Raoual]

@Walter Roberson @Rik When I put breakpoint in the code at both Vcor_final and V_final I got results

It means it's not empty, but when I run all the code I found them empty

When I get out of this loop

They become empty

[Rik]

We don't have your data, so we can't confirm what you see. So far we have no indication that any of your code would make V_final empty.

Since you have an extra end: are you running this in a loop? Is the last iteration perhaps resulting in an empty array?