I'm new to R development, so this may be a trivial question.
In C, How do you convert a SEXP value returned by an R function to a
primitive C type (int, double, char, array, etc.)? I've tried using
the INTEGER(x), VECTOR_ELT(x,i), and similar functions found in /src/
include/Rinternals.h, but doing so results in incorrect results or a
seg-fault.
For example, I modified /tests/Embedding/Rerror.c so that it tries to
print the value returned by the function defined in error.R:
val = Test_tryEval(e, &errorOccurred);
printf("Returned: {%d}\n", VECTOR_ELT(val, 0) );
Where error.R is contains:
foo <-
function(x=3, y=6)
{
z <- x * y
z
}
But the output is just "0", not the correct "18". Any ideas?
Thanks for your help!
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