MATLAB: Matlab language to C

matlab coder

Why this functions doesn't work on matlab coder
function [S,er]=somm1(n)
%n est le nombre de terme de la serie
S=0;
for x = 1:n
S=S+4*(-1)^(x-1)*(1/(2*x-1));
er=abs(S-pi)/pi;
end
It is saying that 'er' is not assigned on some exucution path.
How can I resolve this problem? Thank you

Best Answer

If n is smaller than 1, the loop will not execute, hence er will never get created. Either assign a default value to er before the loop e.g.
er = nan;
for ...
or, if matlab coder supports it (I don't have it so don't know), issue an error before the loop if n is not valid:
if n < 1 
   error('nombre de termes doit etre au moins 1');
end
for ...
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