How to construct this matrix without using two for loops?

4 vues (au cours des 30 derniers jours)
Mohit Kumar
Mohit Kumar le 13 Mai 2021
Hi, I'm trying to construct a matrix in the following manner:
sz=10;
V=rand(sz,sz);
X=rand(sz,sz);
for iter1=1:sz
for iter2=1:sz
A(iter1,iter2) = sum((V(:,iter1)*V(:,iter2)').*X,[1 2]);
end
end
Is there a way to do this without for-loops? I'm sure there must be a way that I haven't been able to think of!
  2 commentaires
DGM
DGM le 13 Mai 2021
Modifié(e) : DGM le 13 Mai 2021
What are i and j? By default, both i and j are sqrt(-1), which isn't a valid index. Are they supposed to be iter1 and iter2, or are they defined elsewhere and constant within the scope of the loops?
Mohit Kumar
Mohit Kumar le 13 Mai 2021
My bad, i mean iter1 and iter2. Edited the question. Thanks.

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Réponses (1)

Mohit Kumar
Mohit Kumar le 13 Mai 2021
I was able to figure out the answer to this. The formulation can be written as
A = V' * X * V;

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