Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters

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function [eps_original, eps_accelerated] = CL4_PiEstimate(N)
% Input
%  N:           maximum value of n (refer to computer lab slides)
% Output
%  eps_original:      True Percent Relative Error of the original estimate
%  eps_accelerated:   True Percent Relative Error of the accelerated estimate
eps_original = 0;
eps_accelerated = 0;
%Vector and matrix needed for computation
v = zeros(1,N+1);
M = zeros(N+1,N+1);
pi_estimate=0;
%Write Your Code Here
num = 1;
for n=1:N+1
    v(n)= 4(-1)^(n-1)/(2(n-1)+1)+pi_estimate
    pi_estimate=v(n)
end
    Set M(1,1:N+1)=v(1:N+1)
    for n = 1:N
        for j = 1:N-n+1
            M(n+1,j)=(M(n,j)+M(n,j+1))/2;
        end
    end
end

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Xinmiao Wang 2021-2-18

This is my code for accelerated Maclaurin series, but I am stuck on (n)= 4(-1)^(n-1)/(2(n-1)+1)+pi_estimate for the above errors, even though I am not sure if my code is correct entirely, I want to fix this error first. I appreciate any help!

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