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How to create an n by n wilkinson matrix using diag

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How to create an n by n wilkinson bidiagonal matrix

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Colani Dlamini
Colani Dlamini on 18 Sep 2019
Yes, but the bidiagonal form not the tridiagonal form of wilkinson matrix.
Guillaume
Guillaume on 18 Sep 2019
I know nothing about wilkinson matrices but every reference I find only mention tridiagonal matrices.
Walter Roberson
Walter Roberson on 18 Sep 2019
It looks like for the bidiagonal form, that the main diagonal should be n:-1:1 and that the diagonal to the right of it should be all n .
You can construct bidiagonal matrices by using diag() to construct each of the diagonals, and adding the matrices together.

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Accepted Answer

Bruno Luong
Bruno Luong on 19 Sep 2019
n = 10;
W = spdiags([n:-1:1; n*ones(1,n)]',[0 1],n,n);

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Walter Roberson
Walter Roberson on 19 Sep 2019
I believe that this is a homework assignment that specifically requires diag() be used.

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