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Re: Non-Commutative calculations in Calc, Revisited
From: |
Jay Belanger |
Subject: |
Re: Non-Commutative calculations in Calc, Revisited |
Date: |
Thu, 06 Oct 2005 22:59:34 -0500 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) |
Neon Absentius <absent@sdf.lonestar.org> writes:
...
> However I am more interested in the case that there is a *globally*
> defined associative multiplication and I am using the matrix mode as a
> "poor man's no-commutative algebra mode". In this context my remark
> makes sence. I still believe that there is a need for such a mode,
> perhaps a "sub-mode" of the matrix mode where one assumes that all
> matrices are square. I am not sure how hard this is to implement.
> What do you think Jay?
It shouldn't be hard.
[from a different message]
> BTW my statement that you quoted as it stands it's not true: even if
> we assume that all matrices are square still we cannot necessarily
> compose them unless they have the same dimensions!
Right, but that's not a problem in Calc. Similar to how you can't add
matrices A and B unless they're the same size, but in matrix mode the
user can still enter `a+b' and Calc treats it as if it makes sense;
it's implicitly assumed then that they're appropriate sizes.
> Still it might be usefull to have an assmption that all variables are
> square matrices of *unspecified* dimension.
Yes.
Jay
- Non-Commutative calculations in Calc, Revisited, Neon Absentius, 2005/10/04
- Re: Non-Commutative calculations in Calc, Revisited, Jay Belanger, 2005/10/06
- Re: Non-Commutative calculations in Calc, Revisited, David Kastrup, 2005/10/06
- Re: Non-Commutative calculations in Calc, Revisited, Neon Absentius, 2005/10/06
- Re: Non-Commutative calculations in Calc, Revisited, Neon Absentius, 2005/10/06
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- Message not available
- Re: Non-Commutative calculations in Calc, Revisited, Neon Absentius, 2005/10/06
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- Re: Non-Commutative calculations in Calc, Revisited, David Kastrup, 2005/10/07
- Message not available
- Re: Non-Commutative calculations in Calc, Revisited,
Jay Belanger <=
- Re: Non-Commutative calculations in Calc, Revisited, Jay Belanger, 2005/10/07