Displaying 3 results from an estimated 3 matches for "maxfev".
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2012 Nov 05
1
Error message in nmkb()
Hallo together,
I am trying to use the nmkb() optimizer and I have problems using the
function, as it causes the following error message
Fehler (error)* in while (nf < maxfeval & restarts < restarts.max & dist >
ftol & :
Fehlender Wert (missing value)* , wo (where)* TRUE/FALSE n?tig ist (is
required)*
*translation
Do I need to adjust the control ?
my.optpar3<-nmkb(par=par.start,fn=my.loglike.normal,lower=constLo,upper=999,
control=list(restar...
2012 Sep 16
1
trying to obtain same nls parameters as in example
Dear R-users;
I'm working with a a dataset that was previously used to fit a
nonlinear model of the form:
Y ~ a * (1 + b * log(1 - c * X^d))
The parameters published elsewhere are:
a = 1.758863, b = .217217, c = .99031, and d = .054589
However, there is no way I can replicate this result. I've tried
several options (including SAS) w/o success.
The data is:
X <-
2011 Mar 15
1
Problem with nls.lm function of minpack.lm package.
...nite difference method or the Jacobian function you supply).
There are some strange things going on with your models; in the case of
this call:
out <- nls.lm(par = guess, fn = fcn, jac = fcn.jac,
fcall = f.Th, jcall = j.Th,
h = h, Th = Th, control = nls.lm.control(maxfev = integer(),
maxiter = 10000, nprint=100))
The parameter estimates keep changing even after 1000 iterations. This is
not good.
In the second fit, I change the starting values slightly, to
##starting values (alp = 0.04, n = 1.6, L = 0.5)
guess.k <- c(alp = 0.08, n = 1.61, L =...