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bug#41223: 28.0.50; Calc gives wrong determinant for some matrices with
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From: |
Mattias Engdegård |
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Subject: |
bug#41223: 28.0.50; Calc gives wrong determinant for some matrices with symbolic variables |
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Date: |
Thu, 14 May 2020 10:43:19 +0200 |
14 maj 2020 kl. 00.15 skrev Mauro Aranda <maurooaranda@gmail.com>:
> It is good enough for me. Thanks.
The pleasure was all mine! It has now been pushed to master.
No doubt there are better ways of computing the determinant for non-numeric
matrices. In particular, division shouldn't be necessary at all, and the
current algorithm results in some untidy expressions. For example, the
determinant of
[a 0 0 1]
[0 b 0 0]
[0 0 c 0]
[1 0 0 d]
is given as abc*(d-1/a), falsely giving the impression of being undefined for
a=0, rather than bc(ad-1).