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[Octave-bug-tracker] [bug #53140] Solution of a system of linear equatio

From: Marco Caliari
Subject: [Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.
Date: Tue, 20 Feb 2018 04:26:31 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0

Follow-up Comment #15, bug #53140 (project octave):

@Rik: is it possible to understand whether it is a problem of memory
allocation or not? Because I find quite strange this idea

// Take a first guess that the number of nonzero terms
// will be as many as in b

If you try something like

A = sprand (1000, 1000, rand); x = A \ [1; zeros(999,1)]; nnz (x)

you will see that x is "never" sparse. I would like to investigate more, but I
have no time till the end of February.


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