[Rcpp-devel] Building of a package with roxygen2 using Rcpp in R version 5.1

[Dirk Eddelbuettel]

Hi Andre,

On 5 September 2018 at 15:37, André Luiz Molan wrote:
| Hi,
| 
| I'm trying to create an R package using Rcpp. I am using the "Build" option
| from RStudio and roxygen2 package. My package is build with no error
| messages and normally loaded. However, when I call a function from the new
| package, I have the following message:
| 
| *Error in .Call(<pointer: (nil)>, x) :
|   NULL value passed as symbol address
| Called from: MakeSquare(x = val)*
| 
| 
| This is just a simple function I have created for testing:
| 
| 
| cppFunction('double MakeSquare(double x){
|         double result = 0;
|         result = x*x;
|         return result;
| 
| }')

cppFunction() (as well as sourceCpp)) are not meant for packages.

So create a package:
-  Use File -> New Project -> New Directory -> R Package using Rcpp (this option
   differs across RStudio versions).
-  Alternatively use Rcpp.package.skeleton() (which has a help page as usual).

Add your functions to that package, edit and adjust as needed.

That should work, including with roxygen2.

Dirk

| 
| 
| The Rcpp function I have created above is called by another function:
| 
| CalcSquare <- function(val1,val2){
|     valResult <- (val1 + val2)/2
|     valSquare <- MakeSquare(x = valResult)
|     return(valSquare)
| }
| 
| 
| I have imported all the necessary packages, including Rcpp. I have looked
| at different discussion forums by I did not find any solution.
| 
| I sincerely hope you could help me.
| 
| Best regards,
| 
| André
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