How to simplify a symbolic expression sum of terms involving the Heaviside function

sympref('HeavisideAtOrigin', 1);
syms m n
assume(n, {'positive','integer'})
s(n) = simplify(symsum(heaviside(m), m, [0, n]), 50)

ans = 

How to obtain the symbolic sum ?

Answer 1

[Dyuman Joshi]

For that you have to assume the same for 'm' as well -

sympref('HeavisideAtOrigin', 1);
syms m n positive integer
s(n) = symsum(heaviside(m), m, [0, n])

s(n) = 

[Mohamed]

Thanks a lot

% clear
sympref('HeavisideAtOrigin', 1);
syms  n positive integer
syms m
s(n) = symsum(heaviside(m), m, [0, n])

s(n) = 

assume(m,"positive")
s(n) = symsum(heaviside(m), m, [0, n])

s(n) = 

[Dyuman Joshi]

You're welcome!