我需要使用一个名为的 Fortran 例程dgebal
(文档here)在我的 Rcpparmadillo 代码中。我已包含以下标题:
# include <RcppArmadillo.h>
# include <math.h>
但是,当我尝试使用编译我的代码时sourceCpp()
我收到以下错误:
error: 'dgebal_' was not declared in this scope
如果我进一步包括<R_ext/Lapack.h>
and <R_ext/BLAS.h>
,代码编译没有错误并且运行良好。然而编译器会抛出一堆这样的警告:
C:/PROGRA~1/R/R-32~1.3/include/R_ext/BLAS.h:49:64: warning: declaration of 'double dasum_(const int*, const double*, const int*)' with C language linkage [enabled by default]
C:/PROGRA~1/R/R-32~1.3/library/RCPPAR~1/include/armadillo_bits/def_blas.hpp:76:1: warning: conflicts with previous declaration 'double arma::dasum_(arma::blas_int*, const double*, arma::blas_int*)' [enabled by default]
类似的警告还有很多。我是否正确地假设这是由 Rcpparmadillo 附带的 LAPACK 库引起的,不包括dgebal
,但是它包含在 R 的 LAPACK 库中?我应该关注这些警告吗?最后,有什么办法可以使用dgebal
在我的 Rcpparmadillo 代码中没有编译警告? Rcpp 和 Rcpparmadillo 都是最新的。操作系统是Windows 8.1 64位。
编辑:
感谢 @coatless 和 @Dirk Eddelbuettel 指出这不是 Rcpparmadillo 问题。尽管如此,我的问题仍然存在,我希望获得有关如何解决此问题的建议。下面是说明我的问题的工作示例代码。它编译得很好,但会产生很多上述警告,这似乎不会影响预期的功能,至少根据我有限的测试。如果我删除两个标题R_ext/Lapack.h
and R_ext/BLAS.h
,编译器会抛出上述错误。
#include <RcppArmadillo.h>
#include <math.h>
#include <string.h>
#include <ctype.h>
#include <R.h>
#include <Rinternals.h>
#include <Rmath.h>
#include <R_ext/Lapack.h>
#include <R_ext/BLAS.h>
// [[Rcpp::depends(RcppArmadillo)]]
using namespace Rcpp;
using namespace arma;
// [[Rcpp::export]]
List R_dgebal2(SEXP x)
{
SEXP dims, z, Scale, i_1, i_2;
int n, info;
dims = Rf_getAttrib(x, R_DimSymbol);
n = INTEGER(dims)[0];
z = Rf_duplicate(x); Scale = Rf_allocVector(REALSXP, n);
i_1 = Rf_allocVector(INTSXP, 1); i_2 = Rf_allocVector(INTSXP, 1);
F77_CALL(dgebal)("B", &n, REAL(z), &n, INTEGER(i_1), INTEGER(i_2),
REAL(Scale), &info);
arma::mat zz = as<arma::mat>(wrap(z));
arma::vec scale2 = as<arma::vec>(wrap(Scale));
int i1=as<int>(wrap(i_1)), i2=as<int>(wrap(i_2));
return List::create(_["z"]=zz, _["scale"]=scale2, _["i1"]=i1, _["i2"]=i2);
}
// Test in R
/*** R
Q <- matrix(c(-1.918206e-01,5.999147e-01,0.000000e+00,0.000000e+00,0.000000e+00,1.106148e-01,
-1.152574e+00,5.716490e-01,0.000000e+00,0.000000e+00,0.000000e+00,5.526595e-01,
-1.256864e+00,3.905685e+04,0.000000e+00,0.000000e+00,0.000000e+00,1.929101e-01,
-3.905721e+04,0.000000e+00,8.120577e-02,0.000000e+00,4.923053e-01,3.572873e-01,0.000000e+00),
nrow = 5, byrow = T)
R_dgebal2(Q)
*/