Dear ALL-R helpers,
I want to let R get vector from c ,for example :numeric array ,vector .I saw some exmple like this :
/* useCall3.c */
/* Getting an integer vector from C using .Call */
#include <R.h>
#include <Rdefines.h>
SEXP setInt() { SEXP myint; int *p_myint; int len = 5; PROTECT(myint = NEW_INTEGER(len)); // Allocating storage space p_myint = INTEGER_POINTER(myint); p_myint[0] = 7; UNPROTECT(1); return myint; }
then type at the command prompt:
R CMD SHLIB useCall3.c
to get useCall3.so
In windows platform ,how can I create right dll to let dyn.load use
and for .c ,.call ,external ,what are the differece? which one is better for getting vector from C?
For the code above you certainly want to use .Call(), .C() and won't work with SEXP.
Under Windows, you can also say
R CMD SHLIB useCall3.c
and get the corresponding useCall3.dll instead of useCall3.so. dyn.load() also works as expected, you just need the relevant tools / compiler installed.
Uwe Ligges
thanks in advance
Michael
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