symsum of matrix to extract element in the matrix
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i want to sum this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/313535/image.png)
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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Réponses (1)
Ameer Hamza
le 10 Juin 2020
Symbolic variables cannot be used as vector index. Also, your data is numeric, and it seems that you want to sum rows. Try this
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 = sum(S, 2);
If you want to output in symbolic form
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 = sum(sym(S), 2);
2 commentaires
Ameer Hamza
le 10 Juin 2020
Try this
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];
f = @(j) S(1, j);
Result
>> f(1) % j=1 => S11
ans =
0
>> f(2) % j=2 => S12
ans =
1
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