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symsum indexing with matrix

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Penglin Cai
Penglin Cai 2020-6-9
关闭： Ameer Hamza 2020-6-10
i want to sum this:
The code i used:
syms j
S=[0,1,0,0,0;1/2,0,1/2,0,0;0,1/2,0,1/2,0;0,0,1/2,0,1/2;0,0,0,1,0];
C1=symsum(S(1,j),j,1,5);
The code reterned me error. I want to do the polynomial summation as shwon above. l also would like to extract the element in matrix S for different j. Could you tell me what is the correct code i need to use? Thank you.

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