MATLAB: Save old values in an iteration (while loop)

newton_raphsonwhile

Hi,
In Newton_Raphson iteration, I need to compare old and new values of X so that it stops when their difference is very small. How can I save old values? Thank you very much in advance.

Best Answer

prev_value = inf;
while true
   new_value = .... some calculation
   if abs(prev_value - new_value) < YourTolerance
     break;
   end
   prev_value = new_value;
end
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