What function to use to find matrix condition number?

*To*: mathgroup at smc.vnet.net*Subject*: [mg114407] What function to use to find matrix condition number?*From*: "Nasser M. Abbasi" <nma at 12000.org>*Date*: Fri, 3 Dec 2010 05:22:19 -0500 (EST)*Reply-to*: nma at 12000.org

This is version 8: I'd like to use LinearAlgebra`MatrixConditionNumber to find condition number of some matrix. btw, This command lists the functions in linear algebra. Names["LinearAlgebra`*"] But Mathematica says this package is now obsolete, and functionality is now in the kernel. <<LinearAlgebra` General::obspkg: {At Line = 3, the input was:, <<LinearAlgebra`,LinearAlgebra`} is now obsolete. The legacy version being loaded may conflict with current Mathematica functionality. See the Compatibility Guide for updating information. >> But When I follow the above, I get to page, where at the bottom it shows 3 functions, one of them is MatrixConditionNumber, but it does not show what replaced it in the kernel, instead it points to a link to MathSource article: "These functions were available in previous versions of Mathematica and are now available on the web at library.wolfram.com/infocenter/MathSource/6770" ? So, is there no build-in function to compute condition number now in Mathematica? I know I can find the max eigenvalue, divide it by the min eigenvalue (absolute values), and this gives me the condition number. But should not such a function be part of the system? Or may be I overlooked it? I did search for it, can't find it in the documenation center. btw, I did also try the natural language interface also, and I asked W/ALpha by typing = matrix condition number but it replied back with a chemical formula C16 H13 C1 N2 O, named diazepam, which is not what I wanted. thanks, --Nasser

**Follow-Ups**:**Re: What function to use to find matrix condition number?***From:*Oliver Ruebenkoenig <ruebenko@wolfram.com>