Message-ID: <40393CA0.9060605@pdf.com>
Date: 2004-02-22T23:34:56Z
From: Spencer Graves
Subject: a simple question about a matrix
In-Reply-To: <3A822319EB35174CA3714066D590DCD504AF7824@usrymx25.merck.com>
There are many matrix norms. The Mathematica web site
(http://mathworld.wolfram.com/MatrixNorm.html) says the one Andy just
gave 'is often referred to as "the" matrix norm.' However, there many
others. For some purposes, any matrix norm will do. For other
purposes, you need to know the purpose.
Please excuse me if this seems like a picky, pedantic rant.
spencer graves
Liaw, Andy wrote:
>If the matrix is real, then isn't that just
>sqrt(eigen(crossprod(x))$values[1]) ??
>
>Andy
>
>
>
>>From: li xian
>>
>>suppose x is a matrix.
>>how to define ||x|| in R?
>>
>>thank you!
>>
>>
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