summation operation in matlab
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hello, i am trying to write a code to implement the summation operation but having errors the equation is below. my code is
A=rand(1,10);
N = 6;
for b = 1:N
syms A;
Pb = (A.^N/factorial(N)) / symsum ((A.^i)/(factorial(i)),i,0,N);
% Bp = (Toi.^N)/(factorial(N)) / symsum(Toi.^[0:N]./ factorial([0:N]));
end
and i keep getting this error
??? Error using ==> factorial at 17
N must be a matrix of non-negative integers.
Error in ==> ERLANGB_TEST at 7
Pb = (A.^N/factorial(N)) / symsum ((A.^i)/(factorial(i)),i,0,N);
thanks for your anticipated help.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/158495/image.png)
2 Kommentare
Salaheddin Hosseinzadeh
am 13 Mär. 2014
What is this in your quesion?
% Bp = (Toi.^N)/(factorial(N)) / symsum(Toi.^[0:N]./ factorial([0:N]));
end
thanks
Antworten (3)
Mischa Kim
am 13 Mär. 2014
Joe, use
syms A ii
N = 6;
Pb = A^N/factorial(N)/(symsum(A^ii/factorial(ii),0,N)); % symbolic expression
sPb = subs(Pb,A,3); % substitute 3 for A to get numeric result
1 Kommentar
Mischa Kim
am 14 Mär. 2014
What release are you working with?
What happens when you replace in the equation
factorial(N)
by
sym('N!')
Marta Salas
am 14 Mär. 2014
Bearbeitet: Marta Salas
am 14 Mär. 2014
You must define i as a symbolic variable too, otherwise i is defined as the sqrt(-1)
syms A i
N = 6;
Pb = (A.^N/factorial(N)) / symsum ((A.^i)/factorial(i),i,0,N);
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