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infinite recursion in exponential of sparse matrices #28935

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mwageringel opened this issue Jan 1, 2020 · 9 comments
Closed

infinite recursion in exponential of sparse matrices #28935

mwageringel opened this issue Jan 1, 2020 · 9 comments
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c: symbolics p: major / 3 t: bug
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sage-9.1

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@mwageringel
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sage: matrix([[0]], sparse=True).exp()
...
RecursionError: maximum recursion depth exceeded while calling a Python object

as reported at https://ask.sagemath.org/question/49190/exponential-function-does-not-work-for-diagonal-matrices.

Component: symbolics

Author: Markus Wageringel

Branch: 1ec3605

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/28935
@mwageringel mwageringel added this to the sage-9.1 milestone Jan 1, 2020
@mwageringel
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New commits:

1ec360528935: fix exponential of sparse matrix

@mwageringel
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Commit: 1ec3605

@mwageringel
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Branch: u/gh-mwageringel/28935

@mwageringel
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Author: Markus Wageringel

@fchapoton
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Reviewer: Frédéric Chapoton

@fchapoton
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comment:2

ok, as a bandaid

@vbraun
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vbraun commented Jan 9, 2020

Changed branch from u/gh-mwageringel/28935 to 1ec3605

@vbraun vbraun closed this as completed in ba2f949 Jan 9, 2020
@kcrisman
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Changed commit from 1ec3605 to none

@kcrisman
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comment:4

See also #12101 and some of the comments there - bandaid indeed, due to heavy computation and perhaps people don't want denseness.

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