search for: halton

Thanks for your email. I try to change the name in lowercase but it conflicts with a C implementation also named halton. So I rename the C function halton2() and sobol2() while the Fortran function are HALTON() and SOBOL() (I also try lower case in the Fortran code). Unfortunately, it does not help since I get init.c:97:25: error: use of undeclared identifier 'halton_'; did you mean 'halton2'? {&q...

.../init.c?view=markup&root=rmetrics. Reading https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Registering-native-routines and looking at what is done in stats package, I first thought that the following code will do the job: static const R_FortranMethodDef FortEntries[] = { {"halton", (DL_FUNC) &F77_NAME(HALTON), 7}, {"sobol", (DL_FUNC) &F77_NAME(SOBOL), 11}, {NULL, NULL, 0} }; But I got error messages when building : use of undeclared identifier ?SOBOL_?. I also tried in lower case sobol and halton. Looking at expm package https://r-forge.r-projec...

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 (Fortran types) to the Fort...

In package fOptions, there are functions that generate Halton sequences. The van der Corput sequence for base 2 is a particular case of the Halton sequence generated by: n <- 8 # anything here... x <- runif.halton(n, 1) In fact, x <- runif.halton(n, dim) will generate the van der Corput sequences for the base b as the i-th prime number in x[,i]....

...ct.org Subject: Re: [Rd] registering Fortran routines in R packages Christophe, > On 10 May 2017, at 08:08, Christophe Dutang <dutangc at gmail.com> wrote: > > Thanks for your email. > > I try to change the name in lowercase but it conflicts with a C implementation also named halton. So I rename the C function halton2() and sobol2() while the Fortran function are HALTON() and SOBOL() (I also try lower case in the Fortran code). Unfortunately, it does not help since I get > > init.c:97:25: error: use of undeclared identifier 'halton_'; did you mean 'halton2...

...root=rmetrics. > > Reading https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Registering-native-routines and looking at what is done in stats package, I first thought that the following code will do the job: > > static const R_FortranMethodDef FortEntries[] = { > {"halton", (DL_FUNC) &F77_NAME(HALTON), 7}, > {"sobol", (DL_FUNC) &F77_NAME(SOBOL), 11}, > {NULL, NULL, 0} > }; > > But I got error messages when building : use of undeclared identifier ?SOBOL_?. I also tried in lower case sobol and halton. > > Looking at expm...

...fact that R's quantile() function is a linear combination of 2 order statistics. Basically, I wrote down the mathematical form of the joint pdf for the 2 order statistics (a function of the sample size and the distribution parameters) then performed a pseudo-Monte Carlo integration (i.e. using Halton Draws rather than R's random draws) over the region where the sample quantile exceeds the threshold. In theory, this should work and it takes about 1000 times fewer clock cycles to compute than the Brute Force approach. My problem is that there is a significant discrepancy between the results u...

Dear list useRs, I have to generate a random set of coordinates (x,y) in [-1 ; 1]^2 for say, N points. At each of these points is drawn a circle (later on, an ellipse) of random size, as in: > N <- 100 > > positions <- matrix(rnorm(2 * N, mean = 0 , sd= 0.5), nrow=N) > sizes<-rnorm(N, mean = 0 , sd= 1) > plot(positions,type="p",cex=sizes) My problem is to

In complex analysis, Cauchy's integral theorem states (loosely speaking) that the path integral of any entire differentiable function, around any closed curve, is zero. I would like to see this numerically, using R (and indeed I would like to use the residue theorem as well). Has anyone coded up path integration? -- Robin Hankin Uncertainty Analyst Southampton Oceanography Centre

..., is there any way to measure the "discrepancy" of a sequence? WTIW, ... http://en.wikipedia.org/wiki/Low-discrepancy_sequence ... doesn't look like something implementation-friendly :-) Alberto Monteiro PS: low discrepany sequences are easily generated in R by the functions runif.halton, runif.sobol, etc in library fOptions

...pT+Hrs+Motivado+Visits+StudyT+HrsVis, data=mldata,reflevel="1",rpar=c(Gender="u",Age="u",Lower="u",Mid="u",Net="u",CompT="u",Hrs="u",StudyT="u",HrsVis="u"), correlation=TRUE, drop.index=FALSE, R=500, halton = NA) When I try to run this command, I get the following error messages: Error: object of type 'symbol' is not subsettable In addition: Warning messages: 1: In if (shape == "long") { : the condition has length > 1 and only the first element will be used 2: In if (shape ==...

Dear Listers; Does anybody has experience in doing simulation via Qusi-Monte carlo in R or S-plus, if so, could you like to send a small copy of your program to me, I appreciate and thanks in advance!! Frankly speaking, I am struggling to write this kind of program, while I could not figure out, painful!!!!! Best regards, Tony --------------------------------- [[alternative HTML

This Friday at 12:30 PM EDT We hope to hear more about Astricon and the 1.6 version. A UK legal professional, John Halton of Cripps Harries Hall LLP, joins us to discuss how the law is coming to terms with VOIP. We also expect a visit from Arick of IPKall about what's cooking with them. Most of all, we expect you, the community to share in this experience! For more info see: http://www.VoipUsersConference.org...

dear all, i wonder whether it is possible to estimate a mixed (random parameters) logit model in R. my dataset only includes conditional explanatory (RHS) variables. i've already searched the R-help archives and found slightly comparable questions but no satisfying answers. an old fashoined conditional logit does not work due to the violation of the iia property. a short description of

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