matlab error Too many outputs requested. Most likely cause is missing [] around left hand side that has a comma separated list expansion

Here is my code

for iii=1:num_patch
    %lims=0;
    flag=0;
 for jjj=1:numel(cellsrc)  
  if(iii== cellsrc(jjj))
      flag=1;
  end
 end
 if(flag==0)
   if(lim<=len)  
     im = hcell{(t==iii)};

x={}; % empty cell which will consist all blocks
dct_img=blkproc(im,[8,8],@dct2);% DCT of image using 8X8 block
m=dct_img; % Sorce image in which watermark will be inserted 
temp={};

[values,cell1,R,C]=segmentImg1(m,8,8);

x=cell1;

k=0;
blockcapacity=R*C;
lims=1;
while(lim<=len)
    k=k+1;
    kx=(x{k}); % Extracting block into kx for processing
    for i=1:8 % To address row of block
        for j=1:8 % To adress column of block
            if (i==8) && (j==8)% Eligiblity condition to insert watremark
                % i=1 and j=1 - means embedding element in first bit of every block                             

                      kx(i,j)=rr(lim);

              end            
          end        
      end

      x{k}=kx; kx=[];
      lim=lim+1;
      lims=lims+1;
       if(lims>blockcapacity)
           break;
       end
  end 
  x=desegment(x,48,48);
  x=(blkproc(x,[8 8],@idct2));
  hcell{(t==iii)}=x;
     end
    end
   end

Here am dividing an image into blocks of 48*48 size, total image size is 144*144. Am trying to embed the data into this block using dct. when am trying to embed lengthier data, at the 17th block it showing error like,

Too many outputs requested.  Most likely cause is missing [] around left hand side that has a comma separated list expansion.

Error in main (line 134)
   im = hcell{(t==iii)}; please help me as soon as possible.

Answer 1

[Stephen23]

When t==iii has two or more true values, then this code

hcell{(t==iii)}

returns multiple values in a comma separated list. Note that you can try this yourself:

>> C = {1,2,3};
>> C{[false,false,true]} % only one true index -> one output
ans =  3
>> C{[true,false,true]} %  two true values -> comma separated list
ans =  1
ans =  3
>> out = C{[true,false,true]} % try this!

However you only wrote one output variable, so there is a mismatch between the number of items in this comma separated list and the number of output arguments. Thus the error. To resolve this you could:

1. accept all outputs by using hcell(t==iii) instead.
2. handle the multiple matches (e.g. throw an error).
3. fix the indexing to ensure that there is only one true index.
4. capture the comma separated list using multiple output arguments:

[val1,val3] = C{[true,false,true]}

[ANJU PS]

Thanks for the help..But for the other blocks data is retrieving. Only at the 17th block it throwing this error.

[ANJU PS]

i want to get all the values inside that 48*48 block. If am omitting {} means it wouldnt able to get those values

[Stephen23]

@ANJU PS: then find out why the seventeenth block causes this error, and fix it. Use the debugging tools to help you.