使用R包中的.Fortran()错误提示功能不可用 [英] Using .Fortran() from R package with error saying function not available

问题描述

我尝试了以下代码:

library(quantreg) # to load the package
library(foreign)  # to load the package

.Fortran("rqfn", PACKAGE = "quantreg")

但出现以下错误:

Error in .Fortran("rqfn", PACKAGE = "quantreg") : 
"rqfn" not available for .Fortran() for package "quantreg"

我已经安装了Rtools.但这并不能解决问题. 我还检查了与系统路径有关的问题(例如在此站点中: https://github.com/stan-dev/rstan/wiki/Install-Rtools-for-Windows )，但这没有问题. 有人可以帮我吗?非常感谢.

I have installed Rtools. But it does not solve the problem. I also checked the issues concerning system paths (as in this site: https://github.com/stan-dev/rstan/wiki/Install-Rtools-for-Windows), but there is no problem about that. Could anyone give me a hand? Thank you very much.

推荐答案

您可以构建自己的库:

• 下载rqfn.f和rqfnb.f. stepy方法需要后者.
• 致电R CMD SHLIB rqfn.f rqfnb.f

• 使用如下函数:

• Download rqfn.f and rqfnb.f. The latter is needed for stepy method.
• Call R CMD SHLIB rqfn.f rqfnb.f

• use the function like this:

data(stackloss)
x <- stack.x
y <- stack.loss
n <- length(y)
p <- ncol(x)
dyn.load(paste0("rqfn", .Platform$dynlib.ext))

.Fortran("rqfn",
     as.integer(n),
     as.integer(p),
     a = as.double(t(as.matrix(x))),
     c = as.double(y),
     rhs = double(p),
     d = double(n),
     beta = as.double(0.99995),
     eps = as.double(1e-6),
     tau = as.double(0.5),
     wn = double(10 * n),
     wp = double((p + 3) * p),
     aa = double(p * p),
     it.count = integer(2),
     info = integer(1))

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