clear rows cols maxSteps = steps; minSteps = 1; for stepsIndex=minSteps:maxSteps nRange=stepsIndex; c1Range=stepsIndex; C=max(qdot(1:nRange,1:c1Range)); D=max(C); [rows(stepsIndex), cols(stepsIndex)] = find(qdot(1:nRange, 1:c1Range) == D); end figure(1) plot(rows, cols) title('Peak Qdot') xlabel('n') ylabel('c1')