Im having trouble fixing the "cannot be classified error" in my parfor loop (The variable perror in a parfor cannot be classified)

close all;clear LSNR=0;USNR=1;limit=4; load code_k_mod G1=G; H1=H; rate=4; % Code rate R=1/rate ind=1; indx =1; fid=fopen('Parallel_k_n_L_test_16_6_2014.txt','wt'); parfor SNR=LSNR:0.5:USNR undetected_errors = 0; SNR % Intitializing counters frmerror=0; bitnerr=0; frames=0; while frmerror < limit frames=frames+1 if mod(frames,1000)==0 frames; frmerror; end b=rand_bit(size(G1,1),0.5); co=turbo_encoder_no_int(b,G1); cod1=co; cod=2*cod1-1; EbN0=10^((SNR)/10); si= 1/sqrt(2*(1/rate)*EbN0); noise = (si*randn(size(cod))); tran= cod+noise;

     rcv=(tran);
    % decoder
        [success,kr,dd0,x_hat1]=turbo_decoder_infectious_no_int_z_9_6_2010(rcv,si,H1,co,fid,frames); 
     % ---------------------------------------------
      dseq1=dd0;
     % B E R ------------------
        error=sum(abs(dseq1-b));
     perror1=error/size(b,2);
     perror(frames)=perror1;
     if error~=0
        frmerror=frmerror+1
        bitnerr=bitnerr+error;
        if success == 1
            undetected_errors = undetected_errors +1;
            c_w(indx,:) = co;
            noise_w(indx,:) = noise;
            b_w(indx,:) = b;
            kr_w(indx,:) = kr;
            x_hat1_w(indx,:) = x_hat1;
                      indx = indx +1;
            save debug c_w noise_w b_w kr_w x_hat1_w x_hat2_w x_hat3_w
        end
     end
        end
     merror=mean(perror);
     ferror(ind)=merror;
     frmerr(ind)=frmerror;
     ind=ind+1;
     bits=frames*size(G1,1);
     BER=bitnerr/bits
     FER=frmerror/frames
      end
   fclose('all');

Answer 1

[Raymond Norris]

The formatting of the code isn't displaying properly, so I may not have the same code you have. Could you reformat it? Assuming I have it right, there are a couple of issues, though not classifying perror wasn't one of them. Which version of MATLAB are you running?

1. The parfor must increase by 1 (not 0.5)
2. Look up transparency rules -- you can't call save within the parfor

[Ahmed]

Thanks for reply Actually,I did both your advice but the same error result as in code below (The variable perror in a parfor cannot be classified)

SNRdB=0:0.5:5; SR=length(SNRdB);

parfor SNR=1:SR undetected_errors = 0; SNR

   % Intitializing counters
   frmerror=0;
   bitnerr=0;
   frames=0;

    while frmerror < limit
      frames=frames+1
    if mod(frames,1000)==0
       frames
       frmerror
    end

     b=rand_bit(size(G1,1),0.5);
     co=turbo_encoder_no_int(b,G1);
     cod1=co;
     cod=2*cod1-1;

     % Channel ----------------
     % ------------------------
     EbN0=10^((SNR)/10);
     si= 1/sqrt(2*(1/rate)*EbN0);
     noise = (si*randn(size(cod)));
     tran= cod+noise; 
     % ------------------------
      ------------------------
     rcv=(tran);
         % Decoder ---------------
          [success,kr,dd0,x_hat1]=turbo_decoder_infectious_no_int_z_9_6_2010(rcv,si,H1,co,fid,frames); 
     % ---------------------------------------------
      dseq1=dd0;
     % B E R ------------------
     % ------------------------
     error=sum(abs(dseq1-b));
     perror1=error/size(b,2);
     perror(frames)=perror1;
     if error~=0
        frmerror=frmerror+1
        bitnerr=bitnerr+error;
        if success == 1
            undetected_errors = undetected_errors +1;
            c_w(indx,:) = co;
            noise_w(indx,:) = noise;
            b_w(indx,:) = b;
            kr_w(indx,:) = kr;
            x_hat1_w(indx,:) = x_hat1;

            indx = indx +1;
            %save debug c_w noise_w b_w kr_w x_hat1_w x_hat2_w x_hat3_w
        end
     end

   end
     merror=mean(perror);
     ferror(ind)=merror;
     frmerr(ind)=frmerror;
     ind=ind+1;
     bits=frames*size(G1,1);
     BER=bitnerr/bits
     FER=frmerror/frames

end
 fclose('all');
 toc;