how can I write code to reach my goal as figure below?

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kimy 2021-3-28

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评论： kimy 2021-4-4

Hi guys,

P is a matrix with dimension i*j; n is an integer. How can I write this formula in matlab? Thanks.

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Adam Danz 2021-3-28

What part are you having trouble with? How can we help without doing it for you?

kimy 2021-3-29

在 MATLAB Online 中打开

Hello Adam, in fact I was trying a loop to give the value for rij, also Ci and Vi However, the code I wrote must be wrong. Could you please give me some suggestions? Thanks.

for i=1:n
    for j=1:n
        for k=1:n
            syms k
            R(i,j)=symprod(P(i,k)*P(k,j),k,1,n)^(1/n)
            C(i)=(symprod(R(i,k),k,1,n))^(1/n)
            V(i)=C(i)/sum(C(k),k,1,n);
        end
    end
end

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Answer 1

Adam Danz 2021-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/786171-how-can-i-write-code-to-reach-my-goal-as-figure-below#answer_661534

编辑：Adam Danz 2021-3-29

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> in fact I was trying a loop to give the value for ri

r is an existing matrix. i and k are just indices. So the value of ri is just r(i,:) and the value of rik is r(i,k).

> also Ci and Vi

What's Vi?

For C, is this what you're looking for?

%n = ??  % scalar
%r = ??  % size nxn
C = nan(1,n);
for i = 1:n
    C(i) = nthroot(prod(r(i,1:n)),n);
end

which is the same as

%n = ??  % scalar
%r = ??  % size nxn
C = nthroot(prod(r(1:n,1:n),2),n)

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Adam Danz 2021-3-29

I don't follow what you're saying and it seems like the question and background information is changing with each comment. I've already reached my allotted volunteer time for the day but I can check back later to see if there is a crystal clear question with all the needed background information.

kimy 2021-4-4