Generate a diagonal matrix from the elements of another matrix

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Marco
Marco le 25 Jan 2020
Commenté : Marco le 25 Jan 2020
Good morning, I'm trying to generate a diagonal matrix with non-zero elemets from another matrix.
For example I have a general matrix like: (usually it's around 40x5)
A=[1 2 3 4 5;
6 7 8 9 10];
I would like to generate a matrix with the elements of A on the diagonal, just like:
1 0 0 0 0 0 0 0 0 0
0 2 0 0 0 0 0 0 0 0
0 0 3 0 0 0 0 0 0 0
0 0 0 4 0 0 0 0 0 0
0 0 0 0 5 0 0 0 0 0
0 0 0 0 0 6 0 0 0 0
And so on untili 10.
Can someone help me?
Thanks in advance

Réponse acceptée

Akira Agata
Akira Agata le 25 Jan 2020
I would recommend using diag function.
The following is an example:
A = [1 2 3 4 5;
6 7 8 9 10];
A = A';
output = diag(A(:));
>> output
output =
1 0 0 0 0 0 0 0 0 0
0 2 0 0 0 0 0 0 0 0
0 0 3 0 0 0 0 0 0 0
0 0 0 4 0 0 0 0 0 0
0 0 0 0 5 0 0 0 0 0
0 0 0 0 0 6 0 0 0 0
0 0 0 0 0 0 7 0 0 0
0 0 0 0 0 0 0 8 0 0
0 0 0 0 0 0 0 0 9 0
0 0 0 0 0 0 0 0 0 10
  1 commentaire
Marco
Marco le 25 Jan 2020
It works perfectly! Thanks and sorry for wasting your time on such an easy question.

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