Re: tol, atol and rtol behavior of scipy.sparse.linalg solvers

"Stefan van der Walt" <[email protected]> Tue, 02 May 2023 10:53:17 -0700

Newsgroups	gmane.comp.python.scientific.devel
Message-ID	<[email protected]>

On Mon, May 1, 2023, at 17:44, Robert Kern wrote:
> Here's some numerical analysis course that uses it:
> 
>   http://web.mit.edu/10.001/Web/Tips/Converge.htm

This link also shows why a small atol is useful to guarantee convergence for |x| close to 0. You lose that feature when you set atol = 0, and while it probably depends on the application whether that's desirable or not, I bet that in most cases you'd either want it or it would do no harm.

Stéfan

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