Double sum of this formula

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giometar
giometar 2019-6-21
评论： giometar 2019-6-24
Hello
I need help about this formula:
_{E_n}=\sum_{k=1}^{n}\left ( _{d_k} \sum_{l=0}^{1-k}_{K_l}*{sin^{2l}{b_n_-_1}}\right )
Values of K0 and b0 are known
Thanks

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Shwetank Shrey
Shwetank Shrey 2019-6-21
Just verify once if this is the formula that you needed. You would have to define K, b and n beforehand.
symsum((d(k).*symsum((K(l)*((sin(b(n-1))).^(2.*l))),l,0,(1-k))),k,1,n)
Doc for Symbolic Summation : https://www.mathworks.com/help/symbolic/symbolic-summation.html
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Shwetank Shrey
Shwetank Shrey 2019-6-24
Adjusted according to matlab indexing (1 indexed instead of 0 indexed).
d = randi([0 9], 10, 1);
K = randi([0 9], 10, 1);
b = randi([0 9], 10, 1);
n = 3;
sum_k = 0;
for k = 2 : n+1
sum_l = 0;
for l = 1 : 3-k % this was if you had 1-k which i guess is a typo. anyway add 2 to whatever this would otherwise be.
sum_l = sum_l + (K(l) .* (sin(b(n)).^(2.*l)));
end
sum_k = sum_k + (d(k) .* sum_l);
end
disp(sum_k);
giometar
giometar 2019-6-24
thank you very much
it shoud be k-1

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