[Rcpp-devel] NumericVector Double mismatch when indexing an array

[Goldfeld, Keith]

I am a new Rcpp user, and I have been trying to do a simple exercise of generating random numbers to put into a vector.  To start off, the following code works:
> code <- 'Rcpp::RNGScope scope;
+          Rcpp::NumericVector rn(5);
+          rn = rnorm(5,0,1);
+          return Rcpp::wrap(rn);
+ '
>
> fun <- cxxfunction(body=code, plugin="Rcpp")
cygwin warning:
  MS-DOS style path detected: C:/R/R-215~1.1/etc/i386/Makeconf
  Preferred POSIX equivalent is: /cygdrive/c/R/R-215~1.1/etc/i386/Makeconf
  CYGWIN environment variable option "nodosfilewarning" turns off this warning.
  Consult the user's guide for more details about POSIX paths:
    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
>
> (res <- fun())
[1]  1.7517515  0.3178733 -0.6957581  1.7030360 -1.6546936


When I try to do the same thing, but in a loop as shown here:




> code <- 'Rcpp::RNGScope scope;

+          Rcpp::NumericVector rn(5);

+          for (int i=0; i < 5; i++) {

+            rn(i) = rnorm(1,0,1);

+          }

+          return Rcpp::wrap(rn);

+ '

>

> fun <- cxxfunction(body=code, plugin="Rcpp")

the result is an error message indicating that it cannot convert a NumericVector to double.  Since in the first example I did not index, I am assuming that I have indexed incorrectly, but I can't see how.  Below is the detailed error message - any idea what I am doing wrong?







cygwin warning:

  MS-DOS style path detected: C:/R/R-215~1.1/etc/i386/Makeconf

  Preferred POSIX equivalent is: /cygdrive/c/R/R-215~1.1/etc/i386/Makeconf

  CYGWIN environment variable option "nodosfilewarning" turns off this warning.

  Consult the user's guide for more details about POSIX paths:

    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames

file15182ecd2ee.cpp: In function 'SEXPREC* file15182ecd2ee()':

file15182ecd2ee.cpp:33:31: error: cannot convert 'Rcpp::NumericVector {aka Rcpp::Vector<14>}' to 'Rcpp::traits::storage_type<14>::type {aka double}' in assignment

make: *** [file15182ecd2ee.o] Error 1



ERROR(s) during compilation: source code errors or compiler configuration errors!



Program source:

  1:

  2: // includes from the plugin

  3:

  4: #include <Rcpp.h>

  5:

  6:

  7: #ifndef BEGIN_RCPP

  8: #define BEGIN_RCPP

  9: #endif

 10:

 11: #ifndef END_RCPP

 12: #define END_RCPP

 13: #endif

 14:

 15: using namespace Rcpp;

 16:

 17:

 18: // user includes

 19:

 20:

 21: // declarations

 22: extern "C" {

 23: SEXP file15182ecd2ee( ) ;

 24: }

 25:

 26: // definition

 27:

 28: SEXP file15182ecd2ee(  ){

 29: BEGIN_RCPP

 30: Rcpp::RNGScope scope;

 31:          Rcpp::NumericVector rn(5);

 32:          for (int i=0; i < 5; i++) {

 33:            rn(i) = rnorm(1,0,1);

 34:          }

 35:          return Rcpp::wrap(rn);

 36:






 37: END_RCPP

 38: }

 39:

 40:

Error in compileCode(f, code, language = language, verbose = verbose) :

  Compilation ERROR, function(s)/method(s) not created! cygwin warning:

  MS-DOS style path detected: C:/R/R-215~1.1/etc/i386/Makeconf

  Preferred POSIX equivalent is: /cygdrive/c/R/R-215~1.1/etc/i386/Makeconf

  CYGWIN environment variable option "nodosfilewarning" turns off this warning.

  Consult the user's guide for more details about POSIX paths:

    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames

file15182ecd2ee.cpp: In function 'SEXPREC* file15182ecd2ee()':

file15182ecd2ee.cpp:33:31: error: cannot convert 'Rcpp::NumericVector {aka Rcpp::Vector<14>}' to 'Rcpp::traits::storage_type<14>::type {aka double}' in assignment

make: *** [file15182ecd2ee.o] Error 1

In addition: Warning message:

running command 'C:/R/R-215~1.1/bin/i386/R CMD SHLIB file15182ecd2ee.cpp 2> file15182ecd2ee.cpp.err.txt' had status 1



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