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crr-bigmemory

R package development: how to check whether the type of SEXP is "big.matrix"?

I am developing an R package with low-level C code. Suppose I have following function in my C code.

SEXP myFun(SEXP obj)

I need to know whether the R object obj is a regular matrix or big.matrix (use R package bigmemory) so that I can call different functions for computation.

Is this possible? How could I know the class type of obj?

Solution

  • You can use the inherits function:

    #include <R.h>
#include <Rinternals.h>

SEXP myFun(SEXP obj) {
    if (inherits(obj, "big.memory")) {
        // do stuff
    }
}