Input-Looping Matrix Dimensions Must Agree

I got this error in very early morning:

        Error using  - Matrix dimensions must agree.
        Error in DistMatrix3 (line 23)
           d=sqrt((I-L').^2+(J-M').^2+(K-N').^2);

    Error in coba (line 20)
            d=DistMatrix3(cobat,c);   % calculate the distance

And here is the code of mine: load cobat.txt

    k=input('Enter a number: ');   

    [maxRow, maxCol]=size(cobat);
            for i=1:k
                for j=1:maxCol
               c=input('Enter a number: '); % sequential initialization
                end
            end

      temp=zeros(maxRow,1);   % initialize as zero vector
        u=0;
      while 1,
            d=DistMatrix3(cobat,c);   % calculate the distance 
            [z,g]=min(d,[],2);      % set the matrix g group

            if g==temp,             % if the iteration doesn't change anymore
                break;              % stop the iteration
            else
                temp=g;             % copy the matrix to the temporary variable
            end
            **for i=1:k
                f=find(g==i);
                if f                % calculate the new centroid 
                    c(i,:)=mean(cobat(find(g==i),:),1);**
                end
            end
        end

      y=[cobat,g]

I think the error isn't because the DistMatrix3 itself. It is caused by 'c' inputs. the looping-input. And I guess these lines that should be fixed since it doesn't contain 'j' variables:

    for i=1:k
                    f=find(g==i);
                    if f                % calculate the new centroid 
                        c(i,:)=mean(cobat(find(g==i),:),1);
    end

I'm stuck how I should fix it. Can you guys tell me what should I do to solve this this? Your help will be much appreciated.

Thank you.

[AS]

I am using this code but not understood about number of iteration i.e how many iteration are there in the code