Re: ConditionNumber
- To: mathgroup at smc.vnet.net
- Subject: [mg89532] Re: ConditionNumber
- From: "Dana DeLouis" <dana.del at gmail.com>
- Date: Thu, 12 Jun 2008 02:57:31 -0400 (EDT)
> if you try: Norm->2 you get the message ...
Hi. I have Ver 6, and not 6.0.2
m = RandomInteger[{-9, 9}, {20, 20}] // N;
If I do MatrixConditionNumber[m, Norm->2], it returns unevaluated.
However,
MatrixConditionNumber[m, 2]
65.3896
I don't understand the online code, and the numbers are slightly different,
but is this the same thing? I'm not sure from reading the code.
MatrixConditionNumber[m, LUDecomposition[m], 2]
65.4541
As a side note, the Infinity Norm is now:
LUDecomposition[m] // Last
281.188
and not...
MatrixConditionNumber[m, \[Infinity]]
281.188
--
HTH :>)
Dana DeLouis
Mathematica 6.01 (Windows Vista)
Having to Read 5.0 Help Files
"dh" <dh at metrohm.ch> wrote in message news:g2lnld$iei$1 at smc.vnet.net...
>
>
> Hello,
>
> the entry in the manual about the condition number reads:
>
> "LinearAlgebra`MatrixConditionNumber[mat,Norm->p] p-norm approximate
>
> condition number of a matrix, where p may be 1, 2, or \[Infinity]"
>
> In version 6.0.2, if you try: Norm->2 you get the message that only 1 or
>
> Infinity is allowed.
>
> As the 2 norm is the most common norm, it is hard to see why it should
>
> not work.
>
> Daniel
>
>
>
>
>
> --
>
>
>
> Daniel Huber
>
> Metrohm Ltd.
>
> Oberdorfstr. 68
>
> CH-9100 Herisau
>
> Tel. +41 71 353 8585, Fax +41 71 353 8907
>
> E-Mail:<mailto:dh at metrohm.com>
>
> Internet:<http://www.metrohm.com>
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>
>
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