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Viviana Arrigoni


Active since 2017

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product of nonsingular matrices is singular?
I am generating this 1000x1000 real matrix A that is nonsingular. Linear algebra claims that det(A) = det(A') and that det(AA') ...

casi 4 años ago | 2 answers | 1

2

answers

Question


Running time worsening when matrices of size 2^k are involved.
I have experienced a worsening in the performances of a software when data of size 2^k for some k is involved. The problem is ve...

casi 4 años ago | 0 answers | 0

0

answers

Question


multiple vectors histogram plotting
I would like to plot a histogram like the one in the picture, the x axis is labeled with different matrix names, and for each th...

alrededor de 4 años ago | 1 answer | 0

1

answer

Question


Scanning strings in a string array
I see that if I declare a string between ' ', I can have access to each single character. For instance: >> x = 'abc'...

alrededor de 4 años ago | 2 answers | 0

2

answers

Question


Fiedler matrix determinant behaviour
With the following command I generate a 1000x1000 Fiedler matrix from the Matlab gallery: A = gallery('fiedler',rand...

más de 4 años ago | 1 answer | 0

1

answer

Question


Generate random permutation matrix
I am trying to generate a random square matrix A of dimension n that has one and only one 1 per row and column. My idea is the...

más de 4 años ago | 2 answers | 0

2

answers