similar to: on the optim function

Displaying 20 results from an estimated 8000 matches similar to: "on the optim function"

2010 Jul 07
4
constrained optimization
Dear list, The task view on optimization does not reference a package for non linear constrained optimization problems. Stefan Theussl told me to look at the Rsolnp package, but unfortunately it is not very clear what method is R ported. (The authors ported the matlab code of Yinyu Ye http://www.stanford.edu/~yyye/ <http://www.stanford.edu/%7Eyyye/>) Currently I'm looking for an
2009 Sep 19
1
generic methods - in particular the summary function
Hi all, I'm currently working on the fitdistrplus package (that basically fit distributions). There is something I do not understand about the generic function summary. In the current version on CRAN, there is no NAMESPACE saying S3method(summary, fitdist) . However if we use summary on an object send by fitdist function it works fine... According to R-lang, we have " The most
2009 Apr 29
3
legend with small colored boxes
Hi all, I tried to a nice legend with small boxes filled with the colors used for the plots. But it does nor work, boxes are always filled with black. An example is here plot(1:4,1:4) lines(1:4,4:1, col="blue") legend("top",leg=c("a","b"),col=c("black","blue"), fill=TRUE) How could I specify the colors? the argument col.box is the
2009 May 10
2
Vignettes with missing or empty \VignetteIndexEntry:
Hi, I have a problem when checking the package 'probdistr' (on probability distributions). I got this warning * checking index information ... WARNING Vignettes with missing or empty \VignetteIndexEntry: [1] "probdistr-chi" "probdistr-contextra" "probdistr-discrete" [4] "probdistr-discrextra" "probdistr-exp"
2009 Apr 27
1
problem with symbol function
Hi all, I use the symbol functions to draw circles. But the argument lty does not work on windows but works correctly on my macbook: x <- -4:4 y <- -4:4 plot(x,y,type="n") symbols(0, 0, add = TRUE, circles = 1, inches = 1, fg="black", lty="solid") symbols(0, 0, add = TRUE, circles = 1, inches = 2, fg="black", lty="dashed") The
2009 Nov 13
2
AR(2) modelling
Hi useRs, I'm trying to fit a basic AR(2) model with the 'ar' function. And when I try to check the value of the coefficients, I could not find the same value as the 'ar' function. Here is my example: myserie <- c(212, 205, 210, 213, 217, 222, 216, 218, 220, 212, 215, 236) #plot(myserie, type="l") myserieminus0 <- tail(myserie, -2) myserieminus1 <-
2009 Nov 13
2
AR(2) modelling
Hi useRs, I'm trying to fit a basic AR(2) model with the 'ar' function. And when I try to check the value of the coefficients, I could not find the same value as the 'ar' function. Here is my example: myserie <- c(212, 205, 210, 213, 217, 222, 216, 218, 220, 212, 215, 236) #plot(myserie, type="l") myserieminus0 <- tail(myserie, -2) myserieminus1 <-
2009 Jul 30
1
rowSums, rowMean and rowCumSums?
Dear list, Don't you think it could be useful to have in R base a function rowCumSums, that compute cumulative sums for each row of a matrix? My implementation of rowCumSums is rowCumSums <- function(x) t(mapply(function(row)cumsum(x[row,]), 1:NROW(x))) I'm sure it can be improved to have other arguments like na.rm or dims. Is there any hope to have this function in R?
2015 Sep 17
1
names treatment in optim()
Dear both, I have found that names are not treated in the same way in optim() depending on the optimization method (argument method). The example below shows the difference between the Brent method and the L-BFGS-B method. f <- function(x){ y <- x^2;names(y) <-"f(x)";y} optim(10, f, method="Brent", lower=-1, upper=10)$value optim(10, f, method="L-BFGS-B",
2011 Apr 19
1
An update of the Distribustions man page
Dear list, I would like to suggest a small update the ?Distributions man page of the stats package. The current version contains the following line. The CRAN package \pkg{SuppDists} for additional distributions. I think it would be better to put in this man page a link to the CRAN task view on Distributions http://cran.r-project.org/web/views/Distributions.html. It is not true that the
2009 Jul 21
1
thousands separator
Dear useRs, I was wondering how to deal with data where thousands separator is a space or a comma? with google, I thought I found the answer but the thread ( http://tolstoy.newcastle.edu.au/R/help/06/04/25524.html) just focuses on decimal separator. Is there any function to numbers written like this in a csv file? Thanks in advance Christophe -- Christophe DUTANG Ph. D. student at ISFA
2010 Sep 04
3
How can I fixe convergence=1 in optim
Hi R users, I am using the optim funciton to maximize a log likelihood function. My code is as follows: p<-optim(c(-0.2392925,0.4653128,-0.8332286, 0.0657, -0.0031, -0.00245, 3.366, 0.5885, -0.00008, 0.0786,-0.00292,-0.00081, 3.266, -0.3632, -0.000049, 0.1856, 0.00394, -0.00193, -0.889, 0.5379, -0.000063, 0.213, 0.00338, -0.00026, -0.8912, -0.3023, -0.000056), f,
2009 May 15
3
drawing arrows
Hi, I would like to draw arrows in a classic 2D plot. Which package should I use? is there R base functions that do job? On google, I could not find any useful discussion about this topic, except a link to the function 'grid.arrows' of the grid package. My problem is I would like to draw arrows at the edge of circles drawn by the 'symbols' function. Maybe there is already a
2011 Aug 29
3
gradient function in OPTIMX
Dear R users When I use OPTIM with BFGS, I've got a significant result without an error message. However, when I use OPTIMX with BFGS( or spg), I've got the following an error message. ---------------------------------------------------------------------------------------------------- > optimx(par=theta0, fn=obj.fy, gr=gr.fy, method="BFGS", >
2008 Oct 22
1
optim bug/help?
In the documentation for 'optim' it gives the following function: fr <- function(x) { ## Rosenbrock Banana function x1 <- x[1] x2 <- x[2] 100 * (x2 - x1 * x1)^2 + (1 - x1)^2 } optim(c(-1.2,1), fr) When I run this code I get: $par [1] 1.000260 1.000506 I am sure I am missing something but why isn't 1,1 a better answer? If I plug 1,1 in the function it seems
2009 Feb 22
2
R tutorial
Dear all, I have just found a 'good' tutorial R for datamining. I think it should be on the contributed docs. http://cran.r-project.org/other-docs.html Here is the link http://www.liaad.up.pt/~ltorgo/DataMiningWithR/ What do you think? Kind regards Christophe -- Christophe Dutang Ph. D. student at ISFA, Lyon, France website: http://dutangc.free.fr
2009 Oct 10
2
[R-SIG-Mac] rnorm.halton
Hi all, I need to transform classic 32bit Fortran code to 64bit Fortran code, see the discussion [R-SIG-Mac] rnorm.halton. But I'm clearly a beginner in Fortran... Does someone already do this for his package? From here, http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=linux&db=bks&fname=/SGI_Developer/Porting_Guide/ch03.html , I identify the following changes
2009 Feb 24
2
Tracing gradient during optimization
Hi everyone, I am currently using the function optim() to maximize/minimize functions and I would like to see more output of the optimization procedure, in particular the numerical gradient of the parameter vector during each iteration. The documentation of optim() describes that the trace parameter should allow one to trace the progress of the optimization. I use the following command:
2011 Aug 13
3
optimization problems
Dear R users I am trying to use OPTIMX(OPTIM) for nonlinear optimization. There is no error in my code but the results are so weird (see below). When I ran via OPTIM, the results are that Initial values are that theta0 = 0.6 1.6 0.6 1.6 0.7. (In fact true vales are 0.5,1.0,0.8,1.2, 0.6.) -------------------------------------------------------------------------------------------- >
2010 Feb 08
2
the hat ^ in regular expression
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