[#109095] [Ruby master Misc#18888] Migrate ruby-lang.org mail services to Google Domains and Google Workspace — "shugo (Shugo Maeda)" <noreply@...>
Issue #18888 has been reported by shugo (Shugo Maeda).
16 messages
2022/06/30
[ruby-core:108895] [Ruby master Bug#10855] [PATCH] Matrix#inverse returns matrix of integers whenever possible
From:
"mame (Yusuke Endoh)" <noreply@...>
Date:
2022-06-14 06:36:24 UTC
List:
ruby-core #108895
Issue #10855 has been updated by mame (Yusuke Endoh).
Status changed from Open to Third Party's Issue
Now the matrix library is a bundled gem, so (if needed) let's continue to discuss it in their bug tracker https://github.com/ruby/matrix.
----------------------------------------
Bug #10855: [PATCH] Matrix#inverse returns matrix of integers whenever possible
https://bugs.ruby-lang.org/issues/10855#change-97975
* Author: LitoNico (Lito Nicolai)
* Status: Third Party's Issue
* Priority: Normal
* Assignee: marcandre (Marc-Andre Lafortune)
* ruby -v: 2.3.0
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
Currently, Matrix#inverse returns a matrix of Rationals, even when each
element has a denominator of 1. This leads to
> x = Matrix.identity 3
=> Matrix[[1, 0, 0],
[0, 1, 0],
[0, 0, 1]]
> x.inverse
=> Matrix[[(1/1), (0/1), (0/1)],
[(0/1), (1/1), (0/1)],
[(0/1), (0/1), (1/1)]]
Even though `Matrix.identity.inverse` should be identical to `Matrix.identity`.
This patch guarantees that Matrix#inverse will return a matrix of integers
whenever it can. To maintain uniform types across a matrix, the conversion
is only performedif *every* element can be converted to an integer.
---Files--------------------------------
matrix_inverse_to_integer.patch (2.14 KB)
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