[R] optimization problem

[Ravi Varadhan]

Thanks, Erwin, for pointing out this mistake.

Here is the correct function for Frobenius norm.  

Klaus - Just replace the old `dist' with the following one. 

dist <- function(A, B) {
 # Frobenius norm of A - B
  n <- nrow(A)
  sqrt(sum((B - A)^2))
 }

Ravi.

____________________________________________________________________

Ravi Varadhan, Ph.D.
Assistant Professor,
Division of Geriatric Medicine and Gerontology
School of Medicine
Johns Hopkins University

Ph. (410) 502-2619
email: rvaradhan at jhmi.edu


----- Original Message -----
From: Erwin Kalvelagen <erwin.kalvelagen at gmail.com>
Date: Saturday, January 16, 2010 2:35 am
Subject: Re: [R] optimization problem
To: r-help at stat.math.ethz.ch


> Ravi Varadhan <rvaradhan <at> jhmi.edu> writes:
> > dist <- function(A, B) { 
> > # Frobenius norm of A - B	
> > 	n <- nrow(A)
> > 	sum(abs(B - A))
> > }
> > 
> 
> See  for a definition of the 
> Frobenius norm.
> 
> 
> Erwin
> 
> ----------------------------------------------------------------
> Erwin Kalvelagen
> Amsterdam Optimization Modeling Group
> erwin at amsterdamoptimization.com
> 
> 
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> 
> PLEASE do read the posting guide 
> and provide commented, minimal, self-contained, reproducible code.