Hi.
Editing - I had a (3-i) instead of (3+i) in the denominator - it's fixed now:
k = 6;
f = @(x)sum(sqrt((2*k-3)./((3 + [0:(x+1)]).*(2*k-4-[0:(x+1)]))));
x = 0:(2*k-8);
y = zeros(size(x));
for j = 1:length(x)
y(j) = f(x(j));
end
plot(x,y,':+');
hold on;
title(['f(k,x) where k = ' num2str(k)]);
ylabel('f(k,x)'); xlabel('x');
legend('location','southwest');
