# I keep getting this for my function and I don't know how to fix it -- Undefined function 'symsum' for input arguments of type 'double'.

2 views (last 30 days)
Luke Radcliff on 29 May 2016
Answered: VBBV on 5 Jan 2023
This is what have, a pic is also attached of the problem, have to find phi values of n =5,10 and 50
function phi = prob2_6(n)
phi = 13/8 + symsum(((-1).^(n+1)).*factorial(2.*n+1)./factorial(n+2).*factorial(n).*((4).^(2.*n+3)),n,0,n)
return

Image Analyst on 29 May 2016
Alex Lisichenko on 17 Mar 2020
n = 0:N;
phi = 13/8 + sum(((-1).^(n+1)).*factorial(2.*n+1)./(factorial(n+2).*factorial(n).*((4).^(2.*n+3))))

VBBV on 5 Jan 2023
format long
N = [5 10 50];
Phi = prob2_6(N) % call function by passing vector of values with range N
Phi = 1×3
1.618034154176712 1.618033988674355 1.618033988749895
function phi = prob2_6(N)
for k = 1:length(N)
n = 0:N(k);
phi(k) = 13/8+sum(((-1).^(n+1).*factorial(2.*n+1))./(factorial(n+2).*factorial(n).*(4.^(2.*n+3))));
end
end

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