RCPP警告:对"exp"的调用含糊不清

本文介绍了RCPP警告:对"exp"的调用含糊不清的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在编写一个Rcpp代码，如下所示:

I am writing a Rcpp code as below:

// [[Rcpp::depends(RcppArmadillo)]]
// [[Rcpp::depends(BH)]]
// [[Rcpp::plugins(cpp11)]]

#include <RcppArmadillo.h>
#include <boost/random.hpp>
#include <boost/random/uniform_real_distribution.hpp>
#include <math.h>

using namespace Rcpp;
using namespace std;

// [[Rcpp::export]]

 double ks(const double k, const double alpha, const double  mag, const double M0){
    double ksres;
    ksres=  k* std::exp ( alpha*(mag-M0) );
    return(ksres);
    }

但是它表明调用'exp'是模棱两可的".为什么会收到此消息，我将如何解决?

But it shows that "Call to 'exp' is ambiguous". Why do I get this message and how will I solve it?

当我进入sessionInfo()时:

While I get in sessionInfo():

        R version 3.2.4 (2016-03-10)
        Platform: x86_64-apple-darwin13.4.0 (64-bit)
        Running under: OS X 10.12.6 (unknown)

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

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

other attached packages:
[1] Rcpp_0.12.4

loaded via a namespace (and not attached):
 [1] colorspace_1.2-6 scales_0.4.0     plyr_1.8.3       tools_3.2.4       inline_0.3.14    gtable_0.2.0     rstan_2.9.0-3
 [8] gridExtra_2.2.1  ggplot2_2.1.0    grid_3.2.4       munsell_0.4.3    stats4_3.2.4

推荐答案

我建议OP将其关闭或删除.这个问题只是展示了一些允许但不建议使用的C ++用法:

I suggest this to be closed or deleted by OP. The question simply exhibits some allowed-but-not-recommended C++ usage:

包括了额外的标头:数学标头已由Rcpp引入(由RcppArmadillo引入)
您永远都不需要两者 cmath 和 math.h ，而且如此处所述，您也不需要
我们通常建议不要无条件地平整所有名称空间

extra headers included: the math headers are already brought in by Rcpp (which is brought in by RcppArmadillo)
you never ever need both cmath and math.h, and as stated here you do not need either
we generally recommend against flattening all namespaces unconditionally

这样，您的代码看起来像这样(仍然包含未使用的C ++ 11调用，但没有害处):

With this, your code looks like this (still containing a call for C++11 which is not used, but does no harm):

// [[Rcpp::depends(RcppArmadillo)]]
// [[Rcpp::depends(BH)]]
// [[Rcpp::plugins(cpp11)]]

#include <RcppArmadillo.h>
#include <boost/random.hpp>
#include <boost/random/uniform_real_distribution.hpp>

// [[Rcpp::export]]
double ks(const double k, const double alpha, const double  mag, const double M0){
    double ksres;
    ksres=  k* std::exp ( alpha*(mag-M0) );
    return(ksres);
}

/*** R
ks(1.0, 2.0, 3.0, 4.0)
*/

这在我的盒子上编译时没有任何警告(打开了严格的编译器警告，此处未显示输出)并且也按预期运行:

This compiles without any warning whatsoever on my box (with stringent compiler warnings turned on, output not shown here) and runs as expected too:

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

R> ks(1.0, 2.0, 3.0, 4.0)
[1] 0.135335
R>

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brought