Hi, all. Another question as I embark on my first project that uses Rcpp.
Consider the following test code, that comes right off of the Using Matrices
section of the Rcpp-quickref file on CRAN.
RcppExport int test() {
Rcpp::NumericMatrix xx(3,2);
int i;
int xsize = xx.nrow() * xx.ncol();
for (i = 0; i < xsize; i++) {
xx[i] = 7;
}
Rcpp::NumericMatrix::Column z1 = xx( _,1); // line 91
// Rcpp::NumericVector z2 = xx(_,1);
return 0;
}
When I try to compile this code in g++, I get the following:
g++ -O0 -arch x86_64 -g -Wall -fopenmp
-I/Library/Frameworks/R.framework/Resources/include
-I/Library/Frameworks/R.framework/Resources/include/x86_64
-I/usr/local/include
-I/Library/Frameworks/R.framework/Resources/library/Rcpp/include -c
Rcpp_omp.cpp -o Rcpp_omp.o
Rcpp_omp.cpp: In function ‘int test()’:
Rcpp_omp.cpp:91: error: ‘_’ was not declared in this scope
Rcpp_omp.cpp:91: warning: unused variable ‘z1’
and I get something similar if I comment out the z1 assignment instead of z2.
I tried playing around with spacing around the underscore, to no avail. This
also happens with the Intel compiler, so I doubt it's that.
>From sessionInfo(), I confirmed that I have Rcpp 0.9.2 installed.
It seems like I am doing *exactly* what is in the documentation. Am I missing
something?
Thanks,
Michael
-------------------------------------------
Michael Braun
Homer A. Burnell (1928) Career Development Professor,
and Assistant Professor of Management Science (Marketing Group)
MIT Sloan School of Management
100 Main St.., E62-535
Cambridge, MA 02139
bra...@mit.edu
617-253-3436
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