IS THERE ANY WAY TO RESOLVE THIS LOOP ISSUE AS IT TAKES ALOT OF TIME TO EXECUTE

for i=1:size(A,1)

    for j=1:size(A,2)

        if(A(i,j)==100)

          Predict_Value=Pred_Cal(i,j,B(:,j),B);
          Output(i,j)=Predict_Value;
         L=L+1;
         L

        end
    end
end

i have this code the function pred calculates value 1682 times for a single value passed i need these coordinates i,j to to pass it to function where 100 exists,,currently there are 48000 100,s in matric of A, i am using this matric which is of 943*1682...so too much time take in this code kindly help me here in this code for more quick results

[Stephen23]

Start by reading this: http://www.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html