[R] a simple question about a matrix

[Spencer Graves]

      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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