Displaying 6 results from an estimated 6 matches for "gastempt".
2008 May 25
1
How to write a package based on nlme
Dear R Helpers,
I try to write a small package that based on nlme however my code does
not work.
R always appears this message:
Error in eval(expr, envir, enclos) : object "y" not found
where y is the response variable. Please help me out!
This is my code:
require(nlme)
AMPmixed<-function(y, x, S1=c("asymptotic","logistic"), random,data,
2009 Jan 22
4
dimnames in pkg "ipred"
Hello List,
I`m trying to make prediction using a bagged tree with the package ipred. I tried to follow the manual but I`m getting an error message. Also browsing through the list-archive I didn`t find any hint.
Maybe someone can help me?
selbag <- bagging(SOIL_UNIT ~., data=traindat.bin, coob=TRUE)
Error in dimnames(X) <- list(dn[[1L]], unlist(collabs, use.names = FALSE)) :
2007 Apr 20
1
nlme trouble
I am not certain how nlme works so I followed an example from the web (
http://www.menne-biomed.de/gastempt/gastempt1.html). I was able to
successfully reproduce the example. However, when I modified my the example
to use my data and with my formula, I get a set of errors having to do with
the log() function. I get 10 of them (all exactly the same) and there are 10
levels in my factor variable. This seem...
2006 Aug 15
2
nls convergence problem
I'm having problems getting nls to agree that convergence has occurred in a
toy problem.
nls.out never gets defined when there is an error in nls. Reaching the
maximum number of iterations is alway an error, so nls.out never gets
defined when the maximum number of iterations is reched.
>From ?nls.control:
tol: A positive numeric value specifying the tolerance level for
the
2008 Mar 08
1
ask for help on nonlinear fitting
I have a table like the following. I want to fit Cm to Vm like this:
Cm ~ Cl+Q1*b1*38.67*exp(-b1*(Vm-Vp1)*0.03867)/(1+exp(-b1*(Vm-Vp1)*0.03867))^2+Q2*b2*38.67*exp(-b2*(Vm-Vp2)*0.03867)/(1+exp(-b2*(Vm-Vp2)*0.03867))^2
I use nls, with start=list(Q1=2e-3, b1=1, Vp1=-25, Q2=3e-3, b2=1,
Vp2=200). But I always get 'singlular gradient' error like this. But
in SigmaPlot I can get the result. How
2008 Sep 02
2
Help with nonlinear regressional
Dear All,
I am doing experiments in live plant tissue using a laser confocal
microscope. The method is called "fluorescence recovery after
photo-bleaching" (FRAP) and here follows a short summary:
1. Record/ measure fluorescence intensity in a defined, round region of
interest (ROI, in this case a small spot) to determine the initial intensity
value before the bleaching. This