Le 15 mai 2014 à 09:03, Stefano Calza <steca...@gmail.com> a écrit :
> Hi everybody,
>
> I am trying to use big.matrix from Rcpp basically to write some (integer)
> data to a matrix.
>
> I keep getting segmentation fault due to 'memory not mapped'.
> Debugging with gdb I found out that the critical point is
>
> MatrixAccessor<int> ma(*pBigMat);
>
> The function is declared as something like (I just followed the Gallery Rcpp
> example):
>
> RcppExport SEXP myFun(SEXP X, SEXP Y, SEXP Z, SEXP XX, XPtr<BigMatrix>
> pBigMat)
>
> Basically it cannot get to the correct pointer.
>
> The really weird thing is that this error happens ONLY using the function
> built within a package
>
> .Call('myFun',X,Y,Z,XX,bigMat@address,package='myPackage')
>
> BUT if I use the very same code, changing just the declaration
>
> // [Rcpp::export]
> IntegerVector myFun(SEXP X, SEXP Y, SEXP Z, SEXP XX, XPtr<BigMatrix> pBigMat)
>
> and then
>
> sourceCpp('mycode.cpp')
>
> and
>
> myFun(X,Y,Z,XX,bigMat@address)
>
> it works fine!
>
> So what am I doing wrong here? Is the pointer reset somehow? But why only
> when using .Call version?
>
> Thanks
>
> Stefano
If you use a raw .Call, all your parameters have to be SEXP.
If you want to use other parameter types, such as XPtr<BigMatrix>, you need to
use attributes (i.e. sourceCpp or compileAttributes) so that it generates .Call
compatible function for you.
Romain
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