Variables in for loop not updating in following iterations

Hello,

I am trying to write a for loop with variables a and b that start at 1 and 6. The first iteration produces 0.5176 and 12, which is correct. However, all following iterations are the exact same. The second iteration should be 0.261 and 24. What am I doing wrong?

N=input('number of iterations')

a=1

b=6

for x=N

b=2*b;

a=sqrt((2-sqrt(4-a^2)));

L=(a*b)/2;

u=L/(sqrt(1-((a^2)/2)));

pi_est=(u+L)/2;

if pi_est<=3.141592

break

end

er=(u-L)/2;

end

pi_est

N

Answer 1

[Voss]

The loop has only one iteration because N is a scalar

for x=N

To loop N times, you can use

for x=1:N

[Abigail]

That makes so much sense, thank you very much.

[Voss]

You're welcome!