On Wed, Sep 8, 2010 at 6:26 PM, Michael Bernsteiner
dethl...@hotmail.com wrote:
@Barry: Yes it is the Rosenbrock Function. I'm trying out some thing I found
here: http://math.fullerton.edu/mathews/n2003/PowellMethodMod.html
@Ravi: Thanks for your help. I will have a closer look at the BB
] optimized value worse than starting Value
To: Michael Bernsteiner dethl...@hotmail.com
Cc: rvarad...@jhmi.edu, r-help@r-project.org
On Wed, Sep 8, 2010 at 6:26 PM, Michael Bernsteiner
dethl...@hotmail.com wrote:
@Barry: Yes it is the Rosenbrock Function. I'm trying out some thing
I found
here
Barry Rowlingson b.rowlingson at lancaster.ac.uk writes:
On Wed, Sep 8, 2010 at 1:35 PM, Michael Bernsteiner
dethlef1 at hotmail.com wrote:
Dear all,
I'm optimizing a relatively simple function. Using optimize the optimized
parameter value is worse than the starting. why?
I would
Dear all,
I'm optimizing a relatively simple function. Using optimize the optimized
parameter value is worse than the starting.
why?
f-function(delta,P,U){
minimiz-P+delta*U
x-minimiz[1]
y-minimiz[2]
z-100*(y-x^2)^2+(1-x)^2
return(z)
}
result-optimize(f, interval=c(-10,
this helps,
Ravi.
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Michael Bernsteiner
Sent: Wednesday, September 08, 2010 8:36 AM
To: r-help@r-project.org
Subject: [R] optimized value worse than starting Value
Dear all,
I'm optimizing
On Wed, Sep 8, 2010 at 1:35 PM, Michael Bernsteiner
dethl...@hotmail.com wrote:
Dear all,
I'm optimizing a relatively simple function. Using optimize the optimized
parameter value is worse than the starting.
why?
f-function(delta,P,U){
minimiz-P+delta*U
x-minimiz[1]
: Wednesday, September 08, 2010 10:27 AM
To: Michael Bernsteiner
Cc: r-help@r-project.org
Subject: Re: [R] optimized value worse than starting Value
On Wed, Sep 8, 2010 at 1:35 PM, Michael Bernsteiner
dethl...@hotmail.com wrote:
Dear all,
I'm optimizing a relatively simple function. Using
From: rvarad...@jhmi.edu
To: b.rowling...@lancaster.ac.uk; dethl...@hotmail.com
CC: r-help@r-project.org
Subject: RE: [R] optimized value worse than starting Value
Date: Wed, 8 Sep 2010 12:09:31 -0400
Numerical optimisations are best done using as many methods as possible
See the optimx
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