function s = Fnkt(n)
if n <= 0 || n ~= floor(n)
s = 0;
return;
end
syms k x
s = symsum(k,k,0,n);
end
Do you realy want to calculate this symbolically? What about:
function s = Fnkt(n)
if n <= 0 || n ~= floor(n)
s = 0;
else % sum(1:n) with Gauss' method:
s = n * (n + 1) / 2;
end
end
