Save old values in an iteration (while loop)

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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.

Accepted Answer

Walter Roberson
Walter Roberson on 8 Sep 2015
prev_value = inf;
while true
new_value = .... some calculation
if abs(prev_value - new_value) < YourTolerance
prev_value = new_value;

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