Re: [Rd] How to call R from C
Thank you!
I tried to build a C code below, and I got a error message.
Thank you for your help in advance.
C code
#include embeddedRCall.h
int main(int argc, char *argv[])
{
eval_R_command(print, argc, argv);
return(0);
}
=
error message
Configuration: Rtest - Win32 Debug
Compiling...
Rtest.c
Linking...
Rtest.obj : error LNK2001: unresolved external symbol _eval_R_command
Debug/Rtest.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
Rtest.exe - 2 error(s), 0 warning(s)
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Re: [Rd] How to call R from C
On Tue, 23 Nov 2010, Wonjae Lee wrote:
Thank you!
I tried to build a C code below, and I got a error message.
How?: you have not shown us the commands you used.
At a guess you are
on Windows and didn't tell us (see the posting quide)
using MSVC (not supported but may work -- just don't ask us for help)
not linking against R.dll.
There are examples in the tests/Embedding directory of the R sources
-- and they do work on Windows.
Thank you for your help in advance.
C code
#include embeddedRCall.h
int main(int argc, char *argv[])
{
eval_R_command(print, argc, argv);
return(0);
}
=
error message
Configuration: Rtest - Win32 Debug
Compiling...
Rtest.c
Linking...
Rtest.obj : error LNK2001: unresolved external symbol _eval_R_command
Debug/Rtest.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
Rtest.exe - 2 error(s), 0 warning(s)
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[Rd] How to call R from C
Hi all! I read R Extensions manual. But still I am not sure how to call R functions from C. Would any of you give me a sample C code to show how to call R functions - for instance, time series functions - from C in the embedded way of C code? [[alternative HTML version deleted]] __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] How to call R from C
On Tue, 23 Nov 2010 01:24:04 +0900, 이원재wjlee2...@naver.com wrote: Hi all! I read R Extensions manual. But still I am not sure how to call R functions from C. Would any of you give me a sample C code to show how to call R functions - for instance, time series functions - from C in the embedded way of C code? Look at package xts, among many others, for examples (xts is one of the time series classes that makes extensive use of C code). - Brian -- Brian G. Peterson http://braverock.com/brian/ Ph: 773-459-4973 IM: bgpbraverock __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] How to call R from C
Le 22/11/10 17:24, 이원재 a écrit :
Hi all!
I read R Extensions manual.
But still I am not sure how to call R functions from C.
Would any of you give me a sample C code to show how to call R functions - for
instance, time series functions - from C in the embedded way of C code?
As Brian said, there are plenty of examples to follow.
The basic idea is to create a call and evaluate it.
txt - '
#include R.h
#include Rdefines.h
SEXP callrnorm(){
SEXP call = PROTECT( lang2( install( rnorm), ScalarInteger(10) ) ) ;
SEXP res = PROTECT( eval( call, R_GlobalEnv ) ) ;
UNPROTECT(2) ;
return res ;
}
'
writeLines( txt, test.c )
system( R CMD SHLIB test.c )
dyn.load( test.so )
.Call( callrnorm )
or using the inline package :
require(inline)
fx - cfunction( , '
SEXP call = PROTECT( lang2( install( rnorm), ScalarInteger(10) ) ) ;
SEXP res = PROTECT( eval( call, R_GlobalEnv ) ) ;
UNPROTECT(2) ;
return res ;
' , verbose = TRUE)
fx()
And now for the Rcpp plug ;-) calling R functions is dramatically easy
with Rcpp with the Rcpp::Function class.
require(inline)
fx - cxxfunction( , '
// grab the function
Function rnorm(rnorm) ;
// call it
return rnorm(10, _[sd] = 10) ;
' , plugin = Rcpp )
fx()
Romain
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Re: [Rd] How to call R from C
On Tue, 23 Nov 2010 01:24:04 +0900, 이원재wjlee2...@naver.com wrote: Hi all! I read R Extensions manual. But still I am not sure how to call R functions from C. Would any of you give me a sample C code to show how to call R functions - for instance, time series functions - from C in the embedded way of C code? Dirk indicates that I may have misunderstood your question. Perhaps this will help. http://quantitative-ecology.blogspot.com/2008/11/call-c-from-r-and-r-from-c.html If you need further help, please provide a minimal self-contained example of what you're trying to do. - Brian -- Brian G. Peterson http://braverock.com/brian/ Ph: 773-459-4973 IM: bgpbraverock __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
