# Tolerance, correct digits

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mohamed hassan il 12 Mag 2020
Commentato: Akihumi il 12 Mag 2020
i have a code where i have aa while loop and the condition is that the diffrence between two variables is bigger than the tolerence.
If the tolerane is 5E5 what does it actually means ? this has to do with correct digits. It is a numerical method question.
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### Risposte (2)

M il 12 Mag 2020
If the tolerane is 5E5 what does it actually means ?
It depends...
Can you provide the code ?
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mohamed hassan il 12 Mag 2020
newton
a =19
k=3
s=1
tol = 5E-5
while ((d> tol)|
s = s + a;
a = a*6/(k+1);
d = abs(s-a)
k=k+1;
end;

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Akihumi il 12 Mag 2020
You can try to type that in Command Window and you might have your answer right there :)
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mohamed hassan il 12 Mag 2020
Yes and the y in your equation is correct digits but why I dont know how to choose x or why x is 5 in my case.
Akihumi il 12 Mag 2020
I see... but what is the purpose of the while loop and how do you decide the equations in that? For example, why a = a*6/(k+1); ?

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