[英]Options when compiling R code
I usually just copy-paste (or source(..)
) my R code on a console, so that compilation in R is very obscure to me. 我通常只是在控制台上复制粘贴(或
source(..)
)我的R代码,所以R中的编译对我来说是很晦涩的。
When compiling C++ code, one can give indication to the compiler (such as #define
or #pragma
for example) or specific flag to indicate level of optimization (such as -o2
for example). 在编译C ++代码时,可以给编译器一个指示(例如
#define
或#pragma
)或特定的标志来指示优化级别(例如-o2
)。
Is there an equivalent of #InfoForCompiler
or -o2
in R? R中是否有
#InfoForCompiler
或-o2
的等效项? Is it possible to make specific choices about how and when (when defining the function or when calling the function for the first time) an R code is compiled? 是否可以对R代码的编译方式和时间(在定义函数或首次调用函数时)进行特定选择?
Whichever way you choose to compile, from R CMD COMPILE
to R CMD INSTALL
for a package, or via something like Rcpp::sourceCpp()
, it will always be invoked by R itself and 无论选择哪种编译方式,都可以从
R CMD COMPILE
到R CMD INSTALL
进行R CMD COMPILE
,也可以通过Rcpp::sourceCpp()
类的方式进行编译,而该编译将始终由R本身和
CXXFLAGS
CXXFLAGS
$RHOME/etc/Makeconf
(on Debian systems also in /etc/R/Makeconf
$RHOME/etc/Makeconf
查找其值(在Debian系统上也位于/etc/R/Makeconf
~/.R/Makeconf
on a per-user basis. ~/.R/Makeconf
覆盖它们。 But as @nrussell commented this will not affect your already-compiled R interpreter, only incremental new compilations -- for example package installations. 但是正如@nrussell所评论的那样,这不会影响您已经编译的R解释器,只会影响新的增量编译-例如软件包安装。
To change this for R itself, you have to essentially rebuild R from source. 要更改R本身,必须从源头上重建R。
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