Over the PR discussion, Andras mentioned also the good ol' "bandwidth" as a name. While Ralf and I quite dislike the name (especially given the signal and controls meaning) it might be a lost fight to make a new name since

https://nl.mathworks.com/help/matlab/linear-algebra.html?s_tid=CRUX_lftnav    (Click Matrix Structure section)

https://mathworld.wolfram.com/Bandwidth.html   (not mathematica but Weinstein's definition encyclopedia)

https://octave.sourceforge.io/octave/function/bandwidth.html

https://en.wikipedia.org/wiki/Band_matrix  (again includes bandwidth)

Checked but couldn't finds : Julia Linalg, SageMath, Maple

So I'm inclined to follow suit, thoughts?

On Mon, Oct 18, 2021 at 8:55 PM Todd Bailey <shoppert@baileywick.plus.com> wrote:

> In that regard we are thinking the following candidates but please add yours too
>
> get_bandwidth
> nonzero_diags
> count_nonzero_diags
> count_bands
> bandcount

diagonal_bandwidth?

Not something I’ve ever worked with, but having done a quick web search about banded matrices, “diagonal_bandwidth” would work for me.

With best wishes,
Todd

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