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| From: | Markus Mützel |
| Subject: | [Octave-bug-tracker] [bug #60265] Negative zeros in matrices - inconsistency |
| Date: | Sun, 21 Mar 2021 08:14:21 -0400 (EDT) |
| User-agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36 Edg/89.0.774.57 |
Update of bug #60265 (project octave):
Status: None => Need Info
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Follow-up Comment #1:
Octave has a dedicated type for diagonal matrices. Those are similar to sparse
matrices but only store the elements on the diagonal. `eye` returns a diagonal
matrix.
The unary `-` operator on a diagonal matrix returns a diagonal matrix.
On Ubuntu 20.10 with Octave 6.2.1 (hg id 75ba68c686ab), I see the following:
>> A = eye (2)
A =
Diagonal Matrix
1 0
0 1
>> B = [1 0; 0 1]
B =
1 0
0 1
>> 1 ./ (-A)
ans =
-1 Inf
Inf -1
>> 1 ./ (-B)
ans =
-1 -Inf
-Inf -1
Afaict, these are the expected results.
Could you please elaborate what you think is the issue and how that relates to
sympy?
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