Ah! I had all the latest versions on my office computer and forgot to update my laptop as well (which had Rcpp from 0.8.6. from 9/2010 or so).
Thanks. Chris On Wed, May 18, 2011 at 9:07 AM, Dirk Eddelbuettel <e...@debian.org> wrote: > > On 18 May 2011 at 08:42, Chris DuBois wrote: > | Hi all, > | > | I've copied the following from a portion of the "Using matrices" section > of the > | Rcpp Quick Reference guide. I get a compilation error that I'm having > trouble > | decoding. Commenting out the third line allows it to compile, so it must > be > | something I've done wrong with the column selector, but I don't see it. > | > | Thanks in advance, > | Chris > | > | PS. My g++ version is 4.5.2, in case that helps. > | > | src <- ' > | NumericMatrix xx(4, 5); > | std::fill(xx.begin(), xx.end(), 8); > | NumericMatrix::Column zzcol = xx( _, 1); > | return(wrap(1)); > | ' > | fun <- cxxfunction(signature(x="numeric"), body = src, plugin="Rcpp") > | > | file3011595e.cpp:35:39: error: invalid conversion from ‘SEXPREC*’ to > | ‘int’ > | file3011595e.cpp:35:39: error: initializing argument 1 of ‘Rcpp::Matrix > | <RTYPE>::Proxy Rcpp::Matrix<RTYPE>::operator()(int, int) [with int RTYPE > = 14, > | Rcpp::Matrix<RTYPE>::Proxy = double&]’ > | file3011595e.cpp:35:39: error: conversion from > ‘Rcpp::traits::storage_type > | <14>::type’ to non-scalar type ‘Rcpp::Matrix<14>::Column’ requested > | make: *** [file3011595e.o] Error 1 > > Works for me: > > R> src <- ' > + NumericMatrix xx(4, 5); > + std::fill(xx.begin(), xx.end(), 8); > + NumericMatrix::Column zzcol = xx( _, 1); > + return(wrap(1)); > + ' > R> fun <- cxxfunction(signature(x="numeric"), body = src, plugin="Rcpp") > R> fun(4.44) > [1] 1 > R> > > Are you by chance using an ancient Rcpp version? > > Dirk > > -- > Gauss once played himself in a zero-sum game and won $50. > -- #11 at http://www.gaussfacts.com >
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