Displaying 20 results from an estimated 400 matches similar to: "Rounding parameter values in genoud(), Rgenoud package"
2007 May 09
3
Increasing precision of rgenoud solutions
Dear All
I am using rgenoud to solve the following maximization problem:
myfunc <- function(x) {
x1 <- x[1]
x2 <- x[2]
if (x1^2+x2^2 > 1)
return(-9999999)
else x1+x2
}
genoud(myfunc, nvars=2,
Domains=rbind(c(0,1),c(0,1)),max=TRUE,boundary.enforcement=2,solution.tolerance=0.000001)
How can one increase the precision of the solution
$par
[1] 0.7072442 0.7069694
?
I
2010 Oct 13
2
How to fix error in the package 'rgenoud'
Dear R user fellows,
I would like to ask you about the package 'rgenoud' which is a genetic
optimization tool.
I ran the function 'genoud' with two variables to be minimized by the
following command.
result<-genoud(fn,nvars=2,starting.values=c(0.5,0),
pop.size=1000, max.generations=10, wait.generations=3)
Then, I had the following error message.
Error in
2011 Jan 13
1
setting up a genoud run
Hello - and sorry for a possibly stupid question, I'm just starting to
learn rgenoud.
I am defining a function with 5 parameters (p1, p2, p3, p4a, and p4b)
and then want to optimize it using genoud. But I am doing something
wrong.
Before genoud is even able to run it says: "Error in p2 + 1.2 : 'p2'
is missing".
I assume I did not specify it right. My code is below.
The task
2007 Sep 01
1
genoud problem
Hi R users,
"genoud" function of "rgenoud" package will optimize my function. If
opt = genoud(fn,2,max=TRUE,starting.value=c(1,10),........)
opt$value will give the optimized value of the function, "fn". My
problem is from the same opt, can I get the value of the function at the
initial parameter values? I need the initial value of the function for
2010 Apr 18
2
Problem with RGenoud
I've been using RGenoud for a while and it worked smoothly so far. However I
came across a strange problem lately (for me at least...).
It fails after the first individual and I get the following error message
when I set MemoryMatrix = FALSE :
Error in genoud(fn, nvars = 8, max = TRUE, pop.size = 10, :
REAL() can only be applied to a 'numeric', not a 'character'
when I
2005 Jun 01
1
using user-supplied derivatives in rgenoud
I have been using the rgenoud package for a nonlinear least-squares
problem with lots of local minima, and it works very well but takes lots
of time. According to the article refrenced in the documentation, the
original GENOUD-software by the same authors seems to allow for
user-supplied analytical derivatives instead of numerical approximations,
which would probably save some time. Does anybody
2009 Feb 08
0
Initial values of the parameters of a garch-Model
Dear all,
I'm using R 2.8.1 under Windows Vista on a dual core 2,4 GhZ with 4 GB
of RAM.
I'm trying to reproduce a result out of "Analysis of Financial Time
Series" by Ruey Tsay.
In R I'm using the fGarch library.
After fitting a ar(3)-garch(1,1)-model
> model<-garchFit(~arma(3,0)+garch(1,1), analyse)
I'm saving the results via
> result<-model
2010 Feb 04
1
Minimizing two non-linear functions with genoud - Trying to minimize or converge near zero
Hello R users,
I am trying to minimize two functions with genoud. It is actually one function with two sets of data, each of them having two unknown variables (called Vcmax and gi) which have the same value in each of the function. They are called f.1 and f.2 in the code below.
My objective to minimize the functions in order to get the two variables equal in each of the functions. Furthermore, I
2008 May 14
0
Parallel computing with rgenoud and snow: external file I/O possible?
I am trying to use rgenoud and snow with an external model and file I/O.
Unlike the typical application of rgenoud and snow, I need to run an
external executable and do pre- and post-processing of input and output
files for each parameter set generated by genoud(). I'm hoping that
someone can suggest improvements to my approach and a work-around for
file I/O problems I've encountered when
2007 Aug 16
0
Help with optimization using GENOUD
Dear Friends,
I have been trying to learn how to use the derivative free optimization algorithms implemented in the package RGENOUD by Mebane and Sekhon. However, it does not seem to work for reasons best described as my total ignorance. If anybody has experience using this package, it would be really helpful if you can point out where I'm making a mistake.
Thanks in advance
Anup
Sample
2006 Feb 14
1
Parallel computing in R for dummies--how to optimize an external model?
I am trying to use the optimizing function genoud() with the snow
package on a couple of i686 machines running Redhat Linux WS4 . I don't
know anything about PVM or MPI, so I just followed the directions in
snow and rgenoud for the simplest method and started a socket cluster.
My function fn for genoud involves updating an input file for a separate
numerical model with the latest parameter
2011 Jan 20
1
Problems with ecodist
Dear Dr.Goslee and anyone may intrested in matrix manipulate,
I am using your ecodist to do mantel and partial mantel test, I have
locality data and shape variation data, and the two distance matrixs are
given as belowings. When I run the analysis, it is always report that the
matrix is not square, but I didn't know what's wrong with my data. Would you
please help me on this. I am quite
2011 Jun 11
1
Amazon AWS, RGenoud, Parallel Computing
Dear R group,
since I do only have a moderately fast MacBook and I would like to get
my results faster than within 72h per run ( :-((( ), I tried Amazon
AWS, which offers pretty fast computers via remote access. I don't
want to post any code because its several hundreds lines of code, I am
not looking for the "optimal" answer, but maybe some suggestions from
you if faced similar
2011 Oct 12
2
[LLVMdev] [llvm-testresults] bwilson__llvm-gcc_PROD__i386 nightly tester results
Hi Bob, are these performance regressions real? They look pretty serious.
Ciao, Duncan.
On 10/12/11 09:40, llvm-testresults at cs.uiuc.edu wrote:
>
> bwilson__llvm-gcc_PROD__i386 nightly tester results
>
> URL http://llvm.org/perf/db_default/simple/nts/332/
> Nickname bwilson__llvm-gcc_PROD__i386:4
> Name curlew.apple.com
>
> Run ID Order Start Time End Time
>
1999 Mar 17
1
hist(list)?
It seems that the following should work:
> x<-read.table('1A.tab',header=T,skip=1);
> mode(x[1])
[1] "list"
> x[1]
p01
R1-00 0.0295
R1-01 0.0283
R1-02 0.0145
R1-03 0.0235
R1-04 0.0339
R1-05 0.0239
R1-06 0.0414
R1-07 0.0259
> hist(x[1])
Error: hist: x must be numeric
> as.numeric(x[1])
Error: (list) object cannot be coerced to vector type 14
>
2008 Oct 08
0
genoud nonlinear least squares optimisation
Hello,
I am trying to optimise a nonlinear model to derive 'best-fit' parameter
esimates using the genoud function. I have been using the genetic algorithm
- gafit - in order to do this, but I am getting parameter estimates that do
not always reach the global minimum. I am very keen to apply genoud to
optimising this model to see if my results will improve, and also out of
personal
2006 Apr 20
1
Parallel computing with the snow package: external file I/O possible?
Hello,
After getting help to solve part of my problem and some delay on my
part, I am posting a more refined version to see if someone can help me
further. I am trying to autocalibrate a model in my subject area using
the snow and rgenoud packages. I want to use the key function "fn" that
is called by genoud() to finalize input, run the model executable, and
compute the objective
2007 Nov 22
2
manual parallel processing
Hi;
I have a R script that includes a call to genoud(); genoud process lasts
about 4 seconds, what would be OK if I hadn't have to call it about 2000
times. This yields about 2 hours of processing.
And I would like to use this script operationally; so that it should be
run twice a day. It seems to me that the parallel processing option
included in genoud() divides the task inside the function
2011 Feb 03
1
rgenoud for multiple chips: does a more recent special version of "snow" exist?
Dear everyone,
I am trying to run rgenoud on several chips simultaneusly. I used the
instructions provided on Jasjeet Sekhon's Homepage
(http://sekhon.berkeley.edu/rgenoud/multiple_cpus.html).
However, I have the newer version of R (R 2.12) installed - for a
64-bit machine. So, when I tried to install the special version of
"snow" from a zip file provided by Jasjeet on his page, R
2011 Jul 01
2
SNOW libraries/functions, rGenoud
Dear group,
does anybody know how to export libraries/functions to all nodes when
launching snow? I want to use a function from fBasics (dstable) for a
rGenoud optimization routine, but I fail "making the function
accessible" to the nodes created. I know how it works for variables, I
know how it works in snowfall(which cant be used in that case), but I
dont know how it culd work in