Displaying 20 results from an estimated 110 matches similar to: "Newton method iteration problem"
2006 Sep 21
2
wxImage patches
These patches allow the RMagick sample to work with wxRuby2. They also
open up some functions that were %ignored that probably shouldn''t be (at
least with the typemap adjustment).
I think we may need to visit (or document carefully) what happens when
you pass in a string of data to the constructor or to SetAlpha. We need
to decide which setting of static_data is correct for the
[1007] trunk/wxruby2/swig: Fixed Wx::Image#scale and rescale signature, also added needed constants.
2007 May 04
0
[1007] trunk/wxruby2/swig: Fixed Wx::Image#scale and rescale signature, also added needed constants.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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<html xmlns="http://www.w3.org/1999/xhtml">
<head><meta http-equiv="content-type" content="text/html; charset=utf-8" /><style type="text/css"><!--
#msg dl { border: 1px #006 solid; background: #369; padding:
2018 Jul 30
2
trace in uniroot() ?
In looking at rootfinding for the histoRicalg project (see gitlab.com/nashjc/histoRicalg),
I thought I would check how uniroot() solves some problems. The following short example
ff <- function(x){ exp(0.5*x) - 2 }
ff(2)
ff(1)
uniroot(ff, 0, 10)
uniroot(ff, c(0, 10), trace=1)
uniroot(ff, c(0, 10), trace=TRUE)
shows that the trace parameter, as described in the Rd file, does not seem to
be
2010 Jun 21
0
Re ZINB by Newton Raphson??
Dear Mr.Zeileis & all.
(1) Thx for your reply. Yes, I am talk about the function zeroinfl() from the package "pscl". I want to use Newton Raphson to get parameter estimation ZINB, so I try this:
----------------------------------------------------------------------------------------------------------------------------------
> zinb <- zeroinfl(y
2002 Apr 24
1
Newton-Raphson
Hi,
Is there a routine available in R for the Newton-Raphson method for
simulataneous equations in several unknowns?
Thanks
Robert
--
Robert J. Chandran
Department of Botany
3506 Miller Plant Sciences Building
University of Georgia
Athens, GA 30602
Phone: (706)-583-0943
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r-help mailing list -- Read
2010 Jun 21
1
ZINB by Newton Raphson??
Dear all..
I have a respon variable y. Predictor variable are x1, x2, x3, x4, x5
(1) What is the syntax to get paramater estimation of ZINB Model by Newton Raphson (not BFGS)
(2) What syntax to plot probability of observed & predicted of ZINB
Thx.
Regards
Krist.
[[alternative HTML version deleted]]
2004 Aug 26
1
gls: Newton-Raphson or EM?
Hello,
Does anyone know whether the gls function in the nlme library uses the Newton-Raphson or EM algorithm to find the restricted log-likelihood or maximum log-likelihood estimates?
Brendan Klick
bklick@jhsph.edu
[[alternative HTML version deleted]]
2012 May 25
0
Digium's new Community Support Manager - Rusty Newton
We'd like you all to help us welcome Rusty Newton to Digium's Asterisk
development and community support team! Rusty has been with Digium for
over five years, starting in the Technical Support department and then
moving to a sales position where he assisted customers with Asterisk and
Switchvox solutions to their business needs. Prior to joining Digium he
spent more than five years in the
2004 Nov 19
2
glm with Newton Raphson
Hi,
Does anyone know if there is a function to find the maximum likelihood
estimates of glm using Newton Raphson metodology instead of using IWLS.
Thanks
Valeska Andreozzi
--------------------------------------------------------
Department of Epidemiology and Quantitative Methods
FIOCRUZ - National School of Public Health
Tel: (55) 21 2598 2872
Rio de Janeiro - Brazil
2010 Jan 26
1
Newton method
Hi r-users,
I hope somebody can help me with this code.
I would like to solve for z values using newton iteration method. I 'm not sure which part of the code is wrong since I'm not very good at programming but would like to learn. There seem to be some output but what I expected is a vector of z values. Thank you so much for any help given.
newton.inputsingle <-
2011 Jun 02
1
newton raphson
Hi
I would like to use the newton raphson method to find the root if the
equation x^3-0.165*x+0.0003993 without using any readliy available program
in r but instead by writing my own code and loop. the problem is that i
really cant understand how to write the loop so that it keeps using the last
calcualted values. if anyone could help me or give me some tips i would
deeply appriciate it
thanks
2011 Jul 12
1
LOESS function Newton optimization
I have a question about running an optimization function on an existing LOESS
function defined in R. I have a very large dataset (1 million observations)
and have run a LOESS regression. Now, I want to run a Newton-Raphson
optimization to determine the point at which the slope change is the
greatest.
I am relatively new to R and have tried several permutations of the maxNR
and nlm functions with
2005 Nov 16
2
Newton-Raphson
Dear all,
I want to solve a score function by using Newton-Raphson algorithm. Is there such a fucntion in R? I know there's one called optim, but it seems only doing minimizing or maximizing.
Thanks,
Jimmy
2010 Dec 07
0
R programing help-newton iterations for the square root
From: jypuppy36@hotmail.com
To: r-help-bounces@r-project.org
Subject: R programing help-newton iterations for the square root
Date: Tue, 7 Dec 2010 12:00:01 -0800
NEWTON ITERATIONS FOR THE SQUARE ROOT
Newton iterations to find the root of a real valued function f , i.e. a number x for which f (x) = 0, are of the form
Example. To find the square root of a positive number y we can use
2006 May 24
1
general Gauss-Newton or support for NSUR: contemporaneously correlated non-linear models
Dear r-Help readers,
1) Is there support for NSUR in some R package yet?
2) Is there a general function of applying the Gauss-Newton or Marquard
method, in which the function of calculating the partial derivatives can
be specified by the user?
Contemporaneously correlated non-linear models (NSUR) is a method to fit
a system of non-linear equations.
I want to use to fit several non-linear
2011 Aug 10
3
Need help on Newton-Raphson optimization
Hi,
Is there available package on the optimization function using
Newton-Raphson method (iterative quadratic approximation)? I have been using
the 'optim' function in R and found it really unstable (it depends heavily
on the initial values and functional forms). If I have to code it by myself,
can I get some advice on how to start (any good reference or sample code)? I
really
2007 Nov 20
1
How is the Gauss-Newton method compared to Levenberg-Marquardt for curve-fitting?
Hi,
It seems to me that the most suitable method in R for curve-fitting is the use of nls, which uses a Gauss-Newton (GN) algorithm, while the use of the Levenberg-Marquardt (LM) algorithm does not seem to be very stressed in R. According to this [1] by Ripley, 'Levenberg-Marquardt is hardly competitive these days' which could imply the low emphasize on LM in R.
The position of LM is, to
2010 Jan 26
1
newton method for single nonlinear equation
Hi r-users,
I would like to solve for z values using newton iteration method. I 'm not sure which part of the code is wrong since I'm not very good at programming but would like to learn. There seem to be some output but what I expected is a vector of z values. Thank you so much for any help given.
newton.inputsingle <- function(pars,n)
{ runi <- runif(974, min=0, max=1)
2018 Aug 13
1
trace in uniroot() ?
Despite my years with R, I didn't know about trace(). Thanks.
However, my decades in the minimization and root finding game make me like having
a trace that gives some info on the operation, the argument and the current function value.
I've usually found glitches are a result of things like >= rather than > in tests etc., and
knowing what was done is the quickest way to get there.
2009 Mar 23
4
newton method
Hi R-users,
Does R has a topic on newton's method?
Thank you for the info.