MATLAB: Sum of real numbers up to n using recursive code

recursive codesum

I'm trying to make more sense of recursive code as I have only very recently started using matlab. I was wondering how I would go about finding the sum of all real numbers up to x using recursive code, I have done it using if / for / while loops however after trying to self teach myself I would expect to go about this by:
function y = sum(x)
    if x > 0
        y = x * (x+1) / 2
    end
    elseif x <= 0
        y = 'does not exist'
    end 
end
disp(y)
I understand that I am probably wrong, in which case how would I go better about this task. Any help would be appreciated.

Best Answer

function x = t_sum(n)
x=1;
if n>1
    x=n+t_sum(n-1);%recursive
end
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