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pi approximation using a series

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Fe99
Fe99 2021-1-16
编辑： Fe99 2021-1-16
Write a function that will use a series to calculate the value of π. Follow so many articles until the contribution of the last article is lower than 10^-4.Call the function and compare it with matlab function pi.
i tried it like this but it is far from correct.:
x=0;
sum=PI(x)
matlab=exp(x)
function [sum]=PI(x)
n=0;
N=(4*((-1)^i))/(2*i + 1);
sum=clen;
x=x+1;
while N>=10^(-4)
n=n+1;
N=(4*((-1)^i))/(2*i + 1);
sum=sum+N;
end
end

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采纳的回答

KSSV
KSSV 2021-1-16
x = 0 ;
n = 0 ;
while ~(abs(pi-x) <= 10^-4 )
x = x+4*(-1)^n/(2*n+1) ;
n = n+1 ;
end

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