Hi R useRs:
How can I generate a random sample from Maxwell Distribution in C language?
Since I know the function rmaxwell {VGAM}, I tried the function r2c {r2c}.
But I still cannot find the source code.
Thanks for your kind help.
RegaRds,
2010-03-12
Randel
[[alternative HTML version deleted]]
??? wrote:> > > How can I generate a random sample from Maxwell Distribution in C > language? > Since I know the function rmaxwell {VGAM}, I tried the function r2c {r2c}. > But I still cannot find the source code. > >The source code can be downloaded from (or choose your local mirror) http://cran.at.r-project.org/web/packages/VGAM/index.html Dieter Menne -- View this message in context: http://n4.nabble.com/rmaxwell-in-C-tp1590192p1590266.html Sent from the R help mailing list archive at Nabble.com.
rmaxwell() depends on rgamma(), so what you actually need is to download R source (rgamma() might depend further on other functions, though).> library(VGAM) > rmaxwellfunction (n, a) { if (!is.Numeric(n, posit = TRUE, allow = 1)) stop("bad input for argument 'n'") if (any(a <= 0)) stop("argument 'a' must be positive") sqrt(2 * rgamma(n = n, 1.5)/a) } <environment: namespace:VGAM> Regards, Yihui -- Yihui Xie <xieyihui at gmail.com> Phone: 515-294-6609 Web: http://yihui.name Department of Statistics, Iowa State University 3211 Snedecor Hall, Ames, IA On Fri, Mar 12, 2010 at 12:18 AM, ??? <tryshy at 163.com> wrote:> Hi R useRs: > > How can I generate a random sample from Maxwell Distribution in C language? > Since I know the function rmaxwell {VGAM}, I tried the function r2c {r2c}. > But I still cannot find the source code. > > Thanks for your kind help. > > RegaRds, > > 2010-03-12 > > > > Randel > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >
We have done it, thanks very much! 2010-03-13 Randel 发件人: Yihui Xie <xie@yihui.name> 发送时间: 2010-03-12 22:48 主 题: Re: [R] rmaxwell in C 收件人: 王杰彪 <tryshy@163.com> 抄 送: r-help <r-help@r-project.org> The manual R-exts, section 6.7.1 should help if you want to call rgamma() in C. Regards, Yihui -- Yihui Xie <xieyihui@gmail.com> Phone: 515-294-6609 Web: http://yihui.name Department of Statistics, Iowa State University 3211 Snedecor Hall, Ames, IA 2010/3/12 xie <xie@yihui.name>:> rmaxwell() depends on rgamma(), so what you actually need is to download R source (rgamma() might depend further on other functions, though). > >> library(VGAM) >> rmaxwell > function (n, a) > { > if (!is.Numeric(n, posit = TRUE, allow = 1)) > stop("bad input for argument 'n'") > if (any(a <= 0)) > stop("argument 'a' must be positive") > sqrt(2 * rgamma(n = n, 1.5)/a) > } > <environment: namespace:VGAM> > > Regards, > Yihui > -- > Yihui Xie <xieyihui@gmail.com> > Phone: 515-294-6609 Web: http://yihui.name > Department of Statistics, Iowa State University > 3211 Snedecor Hall, Ames, IA > > > > On Fri, Mar 12, 2010 at 12:18 AM, 王杰彪 <tryshy@163.com> wrote: >> Hi R useRs: >> >> How can I generate a random sample from Maxwell Distribution in C language? >> Since I know the function rmaxwell {VGAM}, I tried the function r2c {r2c}. >> But I still cannot find the source code. >> >> Thanks for your kind help. >> >> RegaRds, >> >> 2010-03-12 >> >> >> >> Randel >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > >[[alternative HTML version deleted]]