similar to: Is DUD available in nls()?

Hi, All SAS has DUD (Does not Use Derivatives)/Secant Method for nonlinear regression, does R offer this option for nonlinear regression? I have read the helpfile for nls() and could not find such option, any suggestion? Thanks, Derek [[alternative HTML version deleted]]

> Date: Tue, 2 Apr 2013 06:59:13 -0500 > From: Paul Johnson <pauljohn32 at gmail.com> > To: qi A <send2aqi at gmail.com> > Cc: R-help <r-help at r-project.org> > Subject: Re: [R] DUD (Does not Use Derivatives) for nonlinear > regression in R? > Message-ID: > <CAErODj_1pK8raHyAme_2Wt5zQZ_HqOhRjQ62bChhkORWbW=o2A at mail.gmail.com> > Content-Type:

Dear all, I am using the nlsLM function to fit a Lorentzian function to my experimental data. The LM algorithm should allow to specify limits, but the upper limit appears not to work as expected in my code. The parameter 'w', which is peak width at half maximuim always hits the upper limit if the limit is specified. I would expect the value to be in-between the upper and lower limit with

Hi, I am new to R, and as a first exercise, I decided to try to implement an XIRR function using the secant method. I did a quick search and saw another posting that used the Bisection method but wanted to see if it was possible using the secant method. I would input a Cash Flow and Date vector as well as an initial guess. I hardcoded today's initial date so I could do checks in Excel.

I wanted a function that would give the euclidean distance of a vector. Then I was happy, because I found vecnorm listed on pg 55 of V&R (3rd edn) which I had just bought today. Then I was sad, because R did not have vecnorm. Then I was happy again, because I bethought myself that I could copy the function vecnorm from splus to my code. Then I was sad again because R complained >

I am trying to install minpack.lm on R 3.3.3 (Debian version) on a Chromebook. But I get this error: ``` > install.packages("minpack.lm") Installing package into ?/home/marongiuluigi/R/x86_64-pc-linux-gnu-library/3.3? (as ?lib? is unspecified) trying URL 'https://cran.rstudio.com/src/contrib/minpack.lm_1.2-1.tar.gz' Content type 'application/x-gzip' length 43029 bytes

I am running a multilevel growth curve model to examine predictors of social anhedonia (SA) trajectory through ages 12, 15 and 18. SA is a continuous numeric variable. The age variable (Index1) has been coded as 0 for age 12, 1 for age 15 and 2 for age 18. I am currently using a time varying predictor, stress (LSI), which was measured at ages 12, 15 and 18, to examine whether trajectory/variation

I am running a multilevel growth curve model to examine predictors of social anhedonia (SA) trajectory through ages 12, 15 and 18. SA is a continuous numeric variable. The age variable (Index1) has been coded as 0 for age 12, 1 for age 15 and 2 for age 18. I am currently using a time varying predictor, stress (LSI), which was measured at ages 12, 15 and 18, to examine whether trajectory/variation

Hi all, I am writing a simple function to implement regularfalsi (secant) method. ################################################### regulafalsi=function(f,x0,x1){ x=c() x[1]=x1 i=1 while ( f(x[i])!=0 ) { i=i+1 if (i==2) { x[2]=x[1]-f(x[1])*(x[1]-x0)/(f(x[1])-f(x0)) } else { x[i]=x[i-1]-f(x[i-1])*(x[i-1]-x[i-2])/(f(x[i-1])-f(x[i-2])) } } x[i] }

Thank you, it looks like I have already libisl: ``` apt search libisl Sorting... Done Full Text Search... Done libisl-dbg/oldstable 0.18-1 amd64 manipulating sets and relations of integer points bounded by linear constraints libisl-dev/oldstable 0.18-1 amd64 manipulating sets and relations of integer points bounded by linear constraints libisl15/oldstable,now 0.18-1 amd64

dear R experts--- I have (many) unidimensional root problems. think loc.of.root <- uniroot( f= function(x,a) log( exp(a) + a) + a, c(.,9e10), a=rnorm(1) ) $root (for some coefficients a, there won't be a solution; for others, it may exceed the domain. implied volatilities in various Black-Scholes formulas and variant formulas are like this, too.) except I don't need 1 root, but a

I don't know about the configuration. I installed R using the standard protocol for Chromebook http://blog.sellorm.com/2018/12/20/installing-r-and-rstudio-on-a-chromebook/ the rest, it was done by the system itself... On Tue, Jul 14, 2020 at 1:30 PM Dirk Eddelbuettel <edd at debian.org> wrote: > > > There is something wrong with your system / setup I did not notice first: >

Why fails nls with "singular gradient" here? I post a minimal example on the bottom and would be very happy if someone could help me. Kind regards, ########### # define some constants smallc <- 0.0001 t <- seq(0,1,0.001) t0 <- 0.5 tau1 <- 0.02 # generate yy(t) yy <- 1/2 * ( 1- tanh((t - t0)/smallc) * exp(-t / tau1) ) + rnorm(length(t))*0.01 # show the curve

Hello: The development version of Ecdat on R-Forge contains a vignette in which optim(?, method=?L-BFGS-B?) stops with an error message while violating the lower bound. To see all the details, try the following: install.packages("Ecdat", repos="http://R-Forge.R-project.org") Then do "help(pac=Ecdat)" -> "User guides, package

On 10/2/19 9:47 PM, Jonathan Billings wrote: > On Oct 2, 2019, at 3:39 PM, Ljubomir Ljubojevic <centos at plnet.rs> wrote: >> Richard on CentOS-devel mailing list has similar problem but suggests it >> might be issue only with CentOS, he says he had to add the kernel line >> to make it work. >> Name of the tread is: >> [CentOS-devel] Booting CentOS 8 in a VM

Hi R-help! I'm trying to understand how R's nlm function updates its estimate of the Hessian matrix. The Dennis/Schnabel book cited in the references presents a number of different ways to do this, and seems to conclude that the positive-definite secant method (BFGS) works best in practice (p201). However, when I run my code through the optim function with the method as "BFGS",

Dear All, In the past I have often used minpack (http://bit.ly/zXVls3) relying on the Levenberg-Marquardt algorithm to perform non-linear fittings. However, I have always dealt with a function of a single variable. Is there any difference if the function depends on two variables? To fix the ideas, please consider the function f(R,N)=(a/(log(2*N))+b)*R+c*N^d, where a,b,c,d are fit parameters. For

On 10/2/19 9:27 PM, Jonathan Billings wrote: > On Oct 2, 2019, at 15:14, G?nther J. Niederwimmer <gjn at gjn.priv.at> wrote: >> >> Hello, >> >> Is it a Plan to correct the Broken mdadm and or driver for Intel Chipset C602, >> my Server SuperMicro Board X9SRi-F have a Problem with the new C8 or RH8 ? > > Is there a bug filed on

Hi, I am Ken.. I am trying to add dud(driver update disk) to centos5.6 using network method, I can successfully add dud to centos5.6 using http and ftp method, but fail when using nfs method. However those all three methods are officially supported in the centos5.6. As indicated in the centos5.6 website, we can see they not only support http, ftp, but also nfs.

? Mon, 6 Nov 2023 17:53:49 +0100 Troels Ring <tring at gvdnet.dk> ?????: > Hence I wonder if I could somehow have non linear regression to find > the 3 pK values. Below is HEPESFUNC which delivers charge in the > fluid for known pKs, HEPTOT and SID. Is it possible to have > root-finding in the formula with nls? Sure. Just reformulate the problem in terms of a function that