Re: New keyword name for linalg.lu

Sorry for reviving this thread, but indeed "p_indices" sounding uglier the
more I look at it. Just to summarize what it does to save you from the
thread above;

when

P, L, U = scipy.linalg.lu(A)

is run, currently, P is returning a full 2D array. If A is a tall array
say, (25, 5) then P is necessarily (25, 25). And it is just a permutaiton
matrix, a row shuffled np.eye(25). Instead, you can ask with this new
keyword to return that shuffle pattern. as a 1D array and hence P becomes
(25, ) array. And there are more than rare cases that only L and U is
needed for other purposes.

So we would like to make that matrix vs array switch with a keyword. I
thought "p_indices = True/False" was a good idea but it became a bit
disturbing. Other matlab following software offers a string selector with
"outputForm='matrix'/'vector'" which forces users to remember the options
hence I am voting for a TrueFalse flag. However I can't come up with the
right keyword.

Could you please offer some alternatives even just for inspiration?

Best,
ilhan



On Tue, Apr 25, 2023 at 9:34 AM Jake Bowhay <[email protected]> wrote:

> It would be nice to add a quick note to the docs explaining when/which you
> should use. Currently both state "Compute pivoted LU decomposition of a
> matrix." which while true isn't very helpful for a user trying to decide
> which function to pick!
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