Why symsum does not provide the right result?
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Hi all,
I need to find the symbolic solution of the sum of the mathematical series, but symsum does not provide the right result. Here you an example with the serie:
.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/621068/image.png)
syms i
symsum(i,i)
ans =
i^2/2 - i/2
This is very different from the theretical result. However, if I limit the series as follows:
symsum(i,i,0,100)
ans =
5050
That is corect. However, it is differente than
subs(symsum(i,i),i,100)
ans =
4950
Why symsum does not provide the right result?
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Réponse acceptée
Jan
le 18 Mai 2021
syms i n
symsum(i,i, 1, n)
If you define the sum without limits like in symsum(i,i) something different is calculated according to the documentation ( doc symsum ):
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