is
still there. I also made sure that the function doesnt return NAN or INF
values...
Does anyone have any idea where the problem could come from ?
Many thanks.
To: r-h...@stat.math.ethz.ch
From: bbol...@gmail.com
Date: Tue, 12 Apr 2011 17:24:05 +
Subject: Re: [R] question about optim
chirine wolley wolley.chirine at hotmail.com writes:
Dear R-users, I would like to use optim( ) to minimize a function
which depends on 4 parameters: 2 vectors, a scalar, and a matrix.
And I have a hard to define the parameters at the beginning of the
function, and then to call optim.
of Geriatric Medicine and Gerontology
School of Medicine
Johns Hopkins University
Ph. (410) 502-2619
email: rvarad...@jhmi.edu
- Original Message -
From: sharkoil whitewhale2...@gmail.com
Date: Thursday, October 21, 2010 1:09 am
Subject: Re: [R] question on optim() fn.
To: r-help@r-project.org
Hi,
You are doing the right thing by being concerned about the warning messages.
The warning message of `NaN' usually arises due to illegal arithmetic
operations (in the real number field) such as logarithm or square root of a
negative number. This could happen during the intermediate stages of
Hi Ravi,
Thanks a lot for your informations. I think you are right. Without the
constraints of the parameters, it's easy to get the NaN Produced warning
message. The pdfs I worked on are Burr, Lognormal and Inverse Gaussian
distributions. Lognormal distribution is ok, but I always have warning
thanks. Ravi and Nash.
I will read the new package and may use it after I am familiar with it. I may
bother both of you when I have questions.thanks for that in advance.
Nan
from Montreal
Hi Nan,
You can take a look at the optimx package on CRAN. John Nash and I wrote
this
package to
...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Hey Sky
Sent: Tuesday, September 07, 2010 2:48 PM
To: Ben Bolker; r-h...@stat.math.ethz.ch
Subject: Re: [R] question on optim
thanks. Ben
after read your email, I realized the initial value of w[5]=0 is a stupid
mistake. and I
-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Hey Sky
Sent: Tuesday, September 07, 2010 2:48 PM
To: Ben Bolker; r-h...@stat.math.ethz.ch
Subject: Re: [R] question on optim
thanks. Ben
after read your email, I realized the initial value of w[5]=0 is a stupid
mistake. and I
...@infolink.com.br]
Sent: Wednesday, September 08, 2010 4:26 PM
To: Ravi Varadhan
Cc: 'Hey Sky'; 'Ben Bolker'; r-h...@stat.math.ethz.ch
Subject: Re: [R] question on optim
Dear R-list members,
I am using R 2.11.1 on Windows XP. When I try to install package
optimx through the GUI menu Packages / Install
sorry. there is a type in the following code. there is no w[5]*acwrk[,i] in the
regw equation. the right one should be as following:
regw[,i]-w[1]+ w[2]*eta[m]+exp(w[3]+w[4]*eta[m])*actr[,i]
- Original Message
From: Hey Sky heyskywal...@yahoo.com
To: R r-help@r-project.org
Hi,
I do not see how `data' is used in your objective function.
The objective function is not even evaluable at the initial guess.
myfunc1(guess, mydata)
[1] NaN
I also think that some of the parameters may have to be constrained, for
example, par[1] 0. At a minimum, make sure that the
thanks. Ben
after read your email, I realized the initial value of w[5]=0 is a stupid
mistake. and I have changed it. but I am sorry I cannot reproduce the result,
convergence, as you get. the error message is non-finite finite difference
value [12]. any suggestion about it?
and could you plz
On 10-09-07 02:48 PM, Hey Sky wrote:
thanks. Ben
after read your email, I realized the initial value of w[5]=0 is a
stupid mistake. and I have changed it. but I am sorry I cannot
reproduce the result, convergence, as you get. the error message is
non-finite finite difference value [12]. any
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