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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 11:17:09 -0500 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) |
David Kastrup <dak@gnu.org> writes:
> Jay Belanger <belanger@truman.edu> writes:
>
>> Neon Absentius <absent@sdf.lonestar.org> writes:
>>
>>> When in non-commutative (aka `matrix') mode calc calculates
>>> (a b)^-1 to be a^-1 b^-1 instead of the correct b^-1 a^-1.
>
> Uh, what's correct about b^-1 a^-1?
>
> Set a=[1,1], b=[1;0], then (a b)^-1 = [1], and neither b^-1 nor a^-1
> exist.
>
> This only works with a and b being square matrices.
Oops; you're right.
Of course, the proper fix will no longer give the general
non-commutative operations that Neon wants to work with. Perhaps a
square matrix option should be made to the Calc matrix modes.
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
- Message not available
- Message not available
- Re: Non-Commutative calculations in Calc, Revisited, Neon Absentius, 2005/10/06
- Message not available
- Message not available
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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, 2005/10/07
- Re: Non-Commutative calculations in Calc, Revisited, Jay Belanger, 2005/10/07