Problem with multiple for loops

Question

Harshit 2011-12-31

0
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https://ww2.mathworks.cn/matlabcentral/answers/25046-problem-with-multiple-for-loops

for i=1:n
    for j=1:m
        for k=1:m
             if(k~=j)
                  rij(i,k)=x(i,j)-x(i,k);
                  fij(k) = double((48 /((rij(i,k))^13))-(24 /((rij(i,k))^7)));  
                  p=p+1;
               elseif (k==j)
                       fij(k)=0;
                   else
                       disp('Something went wrong')
               end  
          end
          f(j)=sum(fij);
          xddot(i,j)=f(j)/m;
          x(i+1,j)=x(i,j)+ ((xdot(i,j))*delt);
          xdot(i+1,j)= xdot(i,j) + ((xddot(i,j))*delt);
      end
  end

Above shown is my code and the problem is, in the innermost loop the program is not running the if command properly and just runs the elseif command and gets out of the inner for loop and never returns as it should. Anyone with a solution!

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Answer 1

Jose Jeremias Caballero 2011-12-31

0
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https://ww2.mathworks.cn/matlabcentral/answers/25046-problem-with-multiple-for-loops#answer_32898

在 MATLAB Online 中打开

Observation. 
Since k and j are natural numbers, 
they may be identical or different. 
Now if k is different from j then we do.
rij (i, k) = x (i, j)-x (i, k); 
fij (k) = double ((48 / ((rij (i, k)) ^ 13)) - (24 / ((rij (i, k)) ^ 7))); 
p = p +1; 
contrast model is done 
fij (k) = 0 
So the other option is meaningless.