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...he memory issues could have something to do with the fact that my C code makes repeated use of the gsl_matrix_alloc and gsl_matrix_free functions rather than the R_alloc function (I suspect that the memory is not Garbage collected). I searched the web and found the following suggestion from Bryan Gouch in response to a similar question posted on the gsl discussion forum. "If you want to return an R object containing a gsl_matrix which can be garbage collected then you could use a C++ wrapper, as the C++ interface in R allows the use of separate constructors and destructors. " Would th...