How to retrieve the successive values from the given code

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MINATI
MINATI el 12 de En. de 2020
Comentada: MINATI el 12 de En. de 2020
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))
  2 comentarios
Walter Roberson
Walter Roberson el 12 de En. de 2020
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)

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