How to retrieve the successive values from the given code

syms k r a b

k=7;F = zeros(k,1);F(1)=0;F(2)=1;F(3)=a/2;

for r = 1:k

F(k+3)=(symsum((r+1)*F(r+1)*(k-r+1)*F(k-r+1),r,0,k) -symsum((k-r+1)*F(r)*(k-r+2)*F(k-r+2),r,0,k)...

-symsum((k-r+1)*G(r)*(k-r+2)*F(k-r+2),r,0,k)+(M+L)*(k+1)*F(k+1))/((1+b)*(k+1)*(k+2)*(k+3));

end

disp(F(1:7))

[Walter Roberson]

F = zeroes(k, 1,'sym');

But you need to rewrite the symsum. It is never possible to use a symbolic variable as a subscript. You should just calculate the expression in vectorized form and sum()

Even if using symbolic variables as an index were permitted, with each of your symsum going to k, you are trying to access up to F(k+q) in each symsum even though you have not defined past F(r+2)

[MINATI]

Dear Walter

I have tried the fullcode if you can follow

https://in.mathworks.com/matlabcentral/answers/499982-my-answer-is-not-matching-with-attached-file

Thanks