Groups > comp.soft-sys.math.mathematica > #2716

Re: Permute in KroneckerProduct

From	Michael Weyrauch <michael.weyrauch@gmx.de>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: Permute in KroneckerProduct
Date	2011-05-25 23:33 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<irk3kj$7ai$1@smc.vnet.net> (permalink)
References	<irijlf$qb7$1@smc.vnet.net>

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Hello,

    to be specific assume the subsystems A and B are represented by
n x n matrices.

c=KroneckerProduct[A,B]

then

KroneckerProduct[B, A] =
  Flatten[Partition[c, {n, n}], {{3, 1}, {4, 2}}]

(I hope I understood your question correctly. )

If you want to handle
any tensor rearrangement and contraction then Partition, Flatten, and
Dot are very good friends.

Viel Spa=DF bei der Arbeit...

Michael Weyrauch


Am 25.5.2011 11:54, schrieb Dominic W=F6rner:
> Hi,
>
> I construct a system out of subsystems with same dimensions using KroneckerProduct.
> Then the system is represented as a big matrix. But now I need to rearange the subsystems in a different order. Any advice for the algorithm to permute given subsystem A with subsystem B?
>
> Cheers,
> Dominic
>

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Permute in KroneckerProduct Dominic Wörner <dominic.woerner@mpi-hd.mpg.de> - 2011-05-25 09:54 +0000
  Re: Permute in KroneckerProduct Michael Weyrauch <michael.weyrauch@gmx.de> - 2011-05-25 23:33 +0000

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