Question

我安装了R以及RStudio和RTools，目前我正试图让Rcpp运行。我尝试将此代码作为测试文件：

#include <RcppArmadillo.h>
#include <cmath.h>
//[[Rcpp::depends(RcppArmadillo)]]
using namespace Rcpp;

// [[Rcpp::export]]
double Mutual_Information(
    arma::mat joint_dist
){
  joint_dist = joint_dist/sum(sum(joint_dist));
  double mutual_information = 0;
  int num_rows = joint_dist.n_rows;
  int num_cols = joint_dist.n_cols;
  arma::mat colsums = sum(joint_dist,0);
  arma::mat rowsums = sum(joint_dist,1);
  for(int i = 0; i < num_rows; ++i){
    for(int j = 0; j <  num_cols; ++j){
      double temp = log((joint_dist(i,j)/(colsums[j]*rowsums[i])));
      if(!std::isfinite(temp)){
        temp = 0;
      }
      mutual_information += joint_dist(i,j) * temp; 
    }
  } 
  return mutual_information;    
}

但我收到此错误消息：

c：/ Rtools / mingw_64 / bin / g ++ -std = gnu ++ 11   -I“C：/PROGRA~1/R/R-34~1.2/include”-DNDEBUG -I ../ inst / include -fopenmp -I“C：/ Users / root / Documents / R / win-library / 3.4 / Rcpp / include“-I”C：/Users/root/Documents/R/win-library/3.4/RcppArmadillo/include“-I”C：/ Users / root / OneDrive / Uni / SEMEST~1 / PROJEK~ 1 / test / src“-I”C：/ Users / root / OneDrive / Uni / Semester 3 / Projektarbeit / test / inst / include“

-I“d：/Compiler/gcc-4.9.3/local330/include”-O2 -Wall -mtune = core2 -c rcpp_hello_world.cpp -o rcpp_hello_world.o rcpp_hello_world.cpp:2:19：致命错误： cmath.h：没有这样的文件或   目录#include                      ^编译终止。 make：*** [rcpp_hello_world.o]

错误1 Warnmeldung：AusführungvonKommando   'make -f“C：/PROGRA~1/R/R-34~1.2/etc/x64/Makeconf”-f   “C：/PROGRA~1/R/R-34~1.2/share/make/winshlib.mk”CXX ='$（CXX11）   $（CXX11STD）'CXXFLAGS ='$（CXX11FLAGS）'CXXPICFLAGS ='$（CXX11PICFLAGS）'   SHLIB_LDFLAGS ='$（SHLIB_CXX11LDFLAGS）'SHLIB_LD ='$（SHLIB_CXX11LD）'   SHLIB =“sourceCpp_3.dll”WIN = 64 TCLBIN = 64 OBJECTS =“rcpp_hello_world.o”'   Rcpp :: sourceCpp中的ergab状态2错误（“src / rcpp_hello_world.cpp”）：   构建共享库时出现错误1。另外：警告   message：在normalizePath（path.expand（path），winslash，mustWork）中：
  路径[1] =“C：/用户/根/ OneDrive / UNI /学期   3 / Projektarbeit / test / src /../ inst / include“：Das System kann den   angegebenen Pfad nicht finden

库（“Rcpp”）和库（“RcppArmadillo”）已成功加载...

因此，我理解此错误后无法找到包含文件。编译器正在查找的路径不存在。它应该处理包含路径本身我假设.. 在QT或Visual Studio中包含此头文件可以正常工作..

我是否需要调整一些PATH设置？我在Windows 10 x64上运行它我找不到使用谷歌的任何解决方案，所以我希望你能帮助我。非常感谢

Answer 1

错误消息中没有标头cmath.h。你可能意味着cmath。

修复和简化（无需命名空间声明）文件传递：

#include <RcppArmadillo.h>
#include <cmath>

//[[Rcpp::depends(RcppArmadillo)]]

// [[Rcpp::export]]
double Mutual_Information(arma::mat joint_dist){
  joint_dist = joint_dist/sum(sum(joint_dist));
  double mutual_information = 0;
  int num_rows = joint_dist.n_rows;
  int num_cols = joint_dist.n_cols;
  arma::mat colsums = sum(joint_dist,0);
  arma::mat rowsums = sum(joint_dist,1);
  for(int i = 0; i < num_rows; ++i){
    for(int j = 0; j <  num_cols; ++j){
      double temp = log((joint_dist(i,j)/(colsums[j]*rowsums[i])));
      if(!std::isfinite(temp)){
        temp = 0;
      }
      mutual_information += joint_dist(i,j) * temp; 
    }
  } 
  return mutual_information;    
}

即

R> sourceCpp("/tmp/soQ.cpp")
R>

这里没有错误。

在Rcpp中使用标准包含

1 个答案: