I would like to call C routines from Fortran under linux as suggested in
section 5.6 of
the "Writing R extensions" documentation.
I'm familiar with Fortran but not with C.
I understand the example provided in Fortran:
subroutine testit()
double precision normrnd, x
call rndstart()
x = normrnd()
call dblepr("X was", 5, x, 1)
call rndend()
end
but I don't understand the purpose of this C wrapper:
#include <R.h>
void F77_SUB(rndstart)(void) { GetRNGstate(); }
void F77_SUB(rndend)(void) { PutRNGstate(); }
double F77_SUB(normrnd)(void) { return norm_rand(); }
neither how I should compile it.
Could anyone explain how I should compile and link
the C and Fortran files above, and call the Fortran subroutine from R.
Thanks,
Gilles
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