Displaying 4 results from an estimated 4 matches for "initialvalu".
Did you mean:
initialval
2010 Nov 08
1
try (nls stops unexpectedly because of chol2inv error
...ontinues to run, except
when the internal call (internal to nls) of the chol2inv fails.
============================================
Error in chol2inv(object$m$Rmat()) :
element (2, 2) is zero, so the inverse cannot be computed
In addition: Warning messages:
1: In nls(myModel.nlm, fData, start = initialValues, control =
nls.control(warnOnly = TRUE), :
number of iterations exceeded maximum of 50
2: In nls(myModel.nlm, fData, start = initialValues, control =
nls.control(warnOnly = TRUE), :
singular gradient
===========================================================
Any suggestions on how to prev...
2010 Sep 05
0
cov.unscaled in NLS - how to define cov.scaled to make comparable to SAS proc NLIN output - and theoretically WHY are they different
I am running a 3-parameter nonlinear fit using the default Gauss-Newton
method of nls.
initialValues.L = list(b=4,d=0.04,t=180);
fit.nls.L = nls(
myModel.nlm ,
fData.L,
start = initialValues.L,
control = nls.control(warnOnly = TRUE),
trace=T
);
summary.nls.L = summary(fit.nls.L);
I run the same analysis in SAS proc NLIN.
proc nlin data=apples outest=a;
parms b=4 d=.04 t=180;
model Y = b/(1+...
2008 Aug 10
2
Differential Equations there use in R (population modeling)
...per time step, and a
death rate. The above simply shows an exponential growth rate. I
would like to model species response like the famous exponential
growth rate leveling off at a carrying capacity with all of the three
input variables being on a slider from TeachingDemos package
population# = (initialvalue @ t) - (death rate) + (fecundtity per individual) dt
any ideas
Stephen
--
Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are mammals, and have not exhausted the
annoying l...
2005 Aug 15
16
swig_up
Tracing down some things to add in validators and I''ve run across
something that kinda bothers me...
In order to implement validators you have to override the clone method.
The directors seems to be set up to specifically handle this situation.
However, whenever C++ calls back to the object''s methods the swig_get_up
function is returning false. It seems like swig_up