[Octave-bug-tracker] [bug #34352] sprand/sprandn density argument is not very accurate

[Jordi Gutiérrez Hermoso]

Follow-up Comment #1, bug #34352 (project octave):

Is this a bug?

The matrix you're testing isn't really sparse. If you want a 90% full sparse
matrix, you end up using more memory to store it than if you use dense
storage.

Asking around, it seems sprand's current behaviour matches Matlab's (in my
opinion, undocumented) behaviour.

That being said, this seems like really bizarre behaviour. I'm working on
perhaps a more sensible behaviour that uses randperm, and I saw that our
implementation of randperm is incompatible with Matlab's documented version.

I notice that there are two Matlab features of sprand that we haven't
implemented yet, which allow you to specify the condition number or the
singular values. That seems like a more pressing issue for sprand.

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