# Iteration of Ideal Gas Law

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Sohel Rana on 2 Mar 2021
Edited: Cris LaPierre on 13 May 2021
Hi,
How can I do the iteration for the follwoing Ideal Gas Law? I would like to use the Vn and get the Pn value and compare the Ln value to the L. When Ln and L are very close, it will stop the iteration. I would really appreciate your help.
P=101325;
R=8.314;
r=20*10^-6;
L=117*10^-6;
V=pi*r^2*L;
T=300;
n=(P*V)/(R*T);
% Iteration should start from here
Tn=300+273;
Pn=(n/V)*R*Tn;
stress=Pn;
E=69.22*10^9;
S=stress/E;
dL=S*L;
Ln=L+dL;
Vn=pi*r^2*Ln;
Walter Roberson on 3 Mar 2021
Please note that I am not a category of knowledge, and so should not be named in a tag.

Cris LaPierre on 3 Mar 2021
Edited: Cris LaPierre on 13 May 2021
Iterations can be done using either for loops or while loops.
If you want to repeat until a condition is met, a while loop is probably the best option. You just need to set up a conditional statement that evaluates as false until your statement is true. For example
L=1;
Ln=5;
while abs(Ln-L)>0.1
Ln=Ln-1
end
Ln = 4
Ln = 3
Ln = 2
Ln = 1
There is one thing to be careful of. It is possible to create what is called an infinite loop. This occurs when your contidional statement is always false.
Sohel Rana on 3 Mar 2021
Thank you!