to do with
what code is in control when your R expression needs to be evaluated.
That said, I still don't feel that I have seen good, modern
Open-Source optimization code. I would welcome suggestions of where
one might find such code.
On Wed, Jun 11, 2008 at 3:16 AM, DavidM.UK [EMAIL
I believe nlminb() performs *constrained* optimization, where as nlm() is for
*unconstrained* opimization
So I guess nlm() is for solving min(f[a,b]), and nlminb() min(f[a,b]) given
a+b = c
FYI I think optim() also does constrained optimization, well I've used for
min(f[a,b]) given a = a* and
Firstly surely (CL,PC5) = -0.7416656 is the minima?
I think something like this should work, though I'm not sure
library(MASS)
data(crabs)
crab.pca - prcomp(crabs[,4:8],retx=TRUE)
x- crab.pca$rotation
c.len = length(x[,1])
r.len = length(x[1,])
maxy = which(x == min(x))
x.co -
Hi Duncan,
That fix worked I tested it with plot.pl and test2.pl, but I think a similar
problem is occurring with RGtk, which I need to install before I can use
RGtkviewers which in turn I need before I install IDocs :) I'm hoping the
combination of those modules will allow me to produce
I think one significant problem is the lack of 3D graphics support with
interactivity as per MATLAB ( I here Xgobi offers something hear but I
couldn't comment having not used it)
On the GUI issue, I'm split - once you get used to R then it's great just to
use the command line - but as a
Hi,
I'm wanting to call R from Perl via the RSPerl package. However I cannot
seem to install it on my Macbook (OS X Tiger - R 2.6 - Perl 5.8.6). I try to
install the source downloaded from the sigmahat website - but it seems to
fail - when I search my system for R.pm - I can't find it? Something
Renato,
As you may know the two routines for fitting GARCH models are garchFit
[fGarch] and garch [tseries]. The RMetrics [who are behind the fGarch
library] team have usefully provided a white paper on Garch modeling
available from their website, which includes a simple example of how to fit
a
Hi,
That looks great, but maybe you should have a field R Version Used too. Of
course lots of code in specific versions of R fail when applied in
alternative versions.
Best,
David
U Bristol, UK
PG Student
Jeff-136 wrote:
R Community,
I've put together a website that I thought this
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