错误：使用arma :: dot时对'sdot_'的未定义引用>> [

Question

我使用Rcpp :: sourceCpp（“ test.cpp”），它输出以下错误信息。请注意，check1（）有效，而check2失败。区别是“ arma :: vec”和“ arma :: fvec”。当我在Windows环境中尝试该错误时发生。当我在linux环境下尝试它时，它可以工作。希望有人能帮助我。预先感谢。

C:/RBuildTools/3.5/mingw_64/bin/g++  -std=gnu++11 -I"C:/PROGRA~1/R/R-36~1.1/include" -DNDEBUG -I../inst/include -fopenmp  -I"C:/Users/wenji/OneDrive/Documents/R/win-library/3.6/Rcpp/include" -I"C:/Users/wenji/OneDrive/Documents/R/win-library/3.6/RcppArmadillo/include" -I"Y:/"        -O2 -Wall  -mtune=generic -c check.cpp -o check.o
C:/RBuildTools/3.5/mingw_64/bin/g++ -shared -s -static-libgcc -o sourceCpp_3.dll tmp.def check.o -fopenmp -LC:/PROGRA~1/R/R-36~1.1/bin/x64 -lRlapack -LC:/PROGRA~1/R/R-36~1.1/bin/x64 -lRblas -lgfortran -lm -lquadmath -LC:/PROGRA~1/R/R-36~1.1/bin/x64 -lR
check.o:check.cpp:(.text+0xa18): undefined reference to `sdot_'
collect2.exe: error: ld returned 1 exit status

以下是R环境

R version 3.6.1 (2019-07-05)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18362)

Matrix products: default

Random number generation:
 RNG:     Mersenne-Twister 
 Normal:  Inversion 
 Sample:  Rounding 

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] compiler_3.6.1            tools_3.6.1               RcppArmadillo_0.9.850.1.0
[4] Rcpp_1.0.3 

下面是“ test.cpp”的代码

// [[Rcpp::depends(RcppArmadillo)]]
#include <RcppArmadillo.h>

using namespace Rcpp;

// [[Rcpp::export]]
NumericVector timesTwo(NumericVector x) {
  return x * 2;
}

// [[Rcpp::export]]
arma::vec check1(arma::vec x1, arma::vec x2, int rep){
  int n = x1.size();
  arma::vec y(n);
  y.fill(0);
  for(int i = 0; i < rep; i ++){
    y += x1 * arma::dot(x1, x2);
  }
  return y;
}

// [[Rcpp::export]]
arma::fvec check2(arma::fvec x1, arma::fvec x2, int rep){
  int n = x1.size();
  arma::fvec y(n);
  y.fill(0);
  for(int i = 0; i < rep; i ++){
    y += x1 * arma::dot(x1, x2);
  }
  return y;
}

// You can include R code blocks in C++ files processed with sourceCpp
// (useful for testing and development). The R code will be automatically 
// run after the compilation.
//

/*** R
timesTwo(42)
n = 100000
x1 = rnorm(n)
x2 = rnorm(n)
rep = 1000
system.time(y1 <- check1(x1, x2, rep))
system.time(y2 <- check2(x1, x2, rep))
head(y1)
head(y2)
*/

我使用Rcpp :: sourceCpp（“ test.cpp”），它输出以下错误信息。请注意，check1（）有效，而check2失败。区别是“ arma :: vec”和“ arma :: fvec”。当我...

Answer 1

这里有两个问题：