[Rd] Initializing a large data structure to be accessed strictly within a shared C library

From: James Muller <james.s.muller_at_gmail.com>
Date: Tue, 27 Dec 2011 18:58:46 -0500

Dear R-help members,

*(My apologies for cross-posting to both R-help and R-devel -- this question straddles both domains...)*

The question: Is it possible to initialize and later free a large data structure strictly within a shared C library, to be used by a function in the C library that I'll call from R--without ever having to pass data to and from R? This is analogous to C++ object initialization/use/destruction, but if possible I'd like to stay in C.

The context: I'm implementing a particle swarm optimization of a 60-dimension nonlinear transform, where the transform is defined in a half-gigabyte dataset. By carefully initializing a C struct I can trim a large amount of work from the PSO iteration stage. This is, of course, straight forward if I implement the whole thing in a self-contained C program--however, I'd like R to handle the optimization routines, and my shared library to implement the value function.

So: what do folks think?



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