how to sum of double Product of Series

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khaled elbatawy
khaled elbatawy 2020-9-26
编辑： khaled elbatawy 2020-9-26
Hallo Everyone
I am trying to solve this Equation in Matlab but it gives always error for me
the Equation as follow
the answwer of this should be as follow
for
I have tried with for loop as follows but not working
D_sum_Dy = 0;
n_cyc_t = [1,31,32,1];
for g=1:length(n_cyc_t)
if g > 1
for j=1:(g-1)
for k=1:j
syms N n g k j
g_1 = symprod(N(j)/N(j+1),j,1,(g-1))^(symprod(exp(-n(k)/N(k))-exp(-1)/(1-exp(-1)),k,1,j)-1);
D_sum_Dy = D_sum_Dy+(n/N)*g_1;
end
end
end
Thank you for any help Or if there is easier way to solve it

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