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how can i sum different variables?

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GIORGIA FRANZINO
GIORGIA FRANZINO 2024-1-24
评论： GIORGIA FRANZINO 2024-1-30
I have to perform this calculation and I don't know the tau values so it is a simobolic calculation. How can I implement it? Thank you so much.
a=2 N=4 n=3
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Torsten
Torsten 2024-1-24
编辑：Torsten 2024-1-24
Define a function with the tau-vector, a, n and N as inputs. Then all the operations can and should be done numerically.

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回答（1 个）

Milan Bansal
Milan Bansal 2024-1-30
Ran in:
Hi GIORGIA FRANZINO,
I understand you want to solve the given expression in symbolic form for the case when a = 2, N = 4 and n = 3.
For the particular case when a = 2, N = 4 and n = 3, the expression becomes:
The above expression can be resolved in symbolic form as shown in the code snippet below:
% Define the symbolic variables
syms v1 v2 v3; % Define symbolic variables
% Create symbolic tau vector
tau = [v1 v2 v3];
% use nested for loops to calculate the expression
s = 0; % initialize sum
for i1 = 1:2
s1 = 0;
for i2 = 2:3
s2 = 0;
for i3 = 3:3
p = tau(i1) * tau(i2) * tau(i3);
s2 = s2 + p;
end
s1 = s1+s2;
end
s = s+s1;
end
% display results
disp(s)
Please refer to the following documentation link to learn more about "Symbolic Math Toolbox".
https://www.mathworks.com/help/symbolic/
Hope this helps!

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