MATLAB: How compare the current true value with previous true value

Question

hello…i have used loop and if ..my problem is i want subtract the previous true value of if from current true value of if also >>>anybody can help me i will be regard

Answer 1

lasttruevalue = inf;
for K = 1 : 50
  newvalue = somefunction(K);
  if newvalue > 3
     thistruevalue = newvalue;
     truedifference = thistruevalue - lasttruevalue;
     disp(truedifference);
     lasttruevalue = thistruevalue;
   end
 end