for about three days I have had this error message: Cell contents reference from a non-cell array object.

Question

M Shaka 2015-6-15

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评论： Walter Roberson 2015-6-15

lambda_snr_vec   =  ones(1,nodes);
sigma_sample     =  2;
 Counter = 1;
 for i=1:steps  
for child=1:nodes  
% sampling sigma   
  lambda_snr  = lambda_snr_vec(1,child);
  sum_Delta2              = 0;
    for component=1:Kg;          * * _ |%%%%%the problem is here%%%%%%%| _ * *
               sum_Delta2 = sum_Delta2 +y{child}{component}'*inv(eye(length(find(vector==component)))+lambda_snr* X{child}{component}'* X{child}{component})*y{child}{component};
    end
    A=alpha_sig+((m-1)/2);
    B=beta_sig+(sum_Delta2/2);
    new_sigma_sample= gamrnd(A,B);
   %sampling Wg,k
      for component=1:Kg   
              sigma_star = inv(lambda_snr * eye(cardinality_parents{child}+1) + X{child}{component}*X{child}{component}');
              A = sigma_star * X{child}{component} * y{child}{component};           
              B = new_sigma_sample*sigma_star;
              regress_par_sample{component} = mvnrnd(A,B)';
      end
      %sampling lambda
      sum_regress_para              = 0;
           for component=1:Kg;
               sum_regress_para = sum_regress_para + regress_par_sample{component}'*regress_par_sample{component};
           end
           A = alpha_sig+(Kg*(cardinality_parents{child}+1)/2);
           B = beta_sig+(1/2 * new_sigma_sample* sum_regress_para);
           new_lambda_sample= gamrnd(A,B);

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Guillaume 2015-6-15

The error message should have given you a line where the error occurs. Which line is that? As a rule, when asking help about an error message, paste the entire error message (everything in red) in the body of the question.

M Shaka 2015-6-15

ok. thanks. y is not a cell.

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Answer 1

Guillaume 2015-6-15

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There are a number of cell references used in your code. Are all of them actually cell arrays? In particular:

Are X and y both cell arrays. If not, X{child} or y{child} is invalid
If they are, are all the cell themselves cell arrays. If not, X{child}{componenent} or y{child}{component} is not valid.
Has regress_par_sample been declared as a cell array

The best way for you to find out the problem is to use the debugger. At the command prompt write:

dbstop if error

Run your code, and when it stops see what the content and type of X{child} or y{child} is. Most likely it's empty or not a cell array:

x{child} %view content
y{child} %view content
class(x{child}) %view type, must be cell
class(y{child}) %view type, must be cell

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Answer 2

David H 2015-6-15

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The problem is likely that one of X or y is not defined as a cell array.

Can you put two lines of code before the error which output class(X) and class (y)? If one comes out as something that isn't "cell" look through the rest of the code to find where you might have accidentally overwritten it.

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Answer 3

Walter Roberson 2015-6-15

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At the command prompt, give the command

dbstop if error

and then run the program. When it stops,

if ~iscell(X)
   fprintf(2,'X is not a cell!');
else
  for KKK = 1 : length(X)
    if ~iscell(X{KKK})
      fprintf(2,'X{%d} is not a cell!', KKK);
      break;
    end
  end
end
if ~iscell(y)
   fprintf(2,'y is not a cell!');
else
  for KKK = 1 : length(y)
    if ~iscell(y{KKK})
      fprintf(2,'y{%d} is not a cell!', KKK);
      break;
    end
  end
end

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Walter Roberson 2015-6-15

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Your statement

y=y{child}{component}'

is overwriting all of y with the current component. You do not make the same mistake for x as you use

X=x{child}{component};

notice that the output variable "X" is not the same as the input variable "x" so the treatment of x is fine in that line. On the other hand your line 59 is going to try to access X{child}{component} and that doesn't exist.

You need to review your code and pay attention to the variable names.

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