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#include "embeddedRCall.h"
void bar1() ;
void source(const char *name);
/*
Creates and evaluates a call
to a function giving named arguments
plot(1:10, pch="+")
*/
int
main(int argc, char *argv[])
{
char *localArgs[] = {"R", "--silent"};
init_R(sizeof(localArgs)/sizeof(localArgs[0]), localArgs);
source("foo.R");
bar1();
end_R();
return(0);
}
/*
This arranges for the command source("foo.R")
to be called and this defines the function we will
call in bar1.
*/
void
source(const char *name)
{
SEXP e;
PROTECT(e = lang2(install("source"), mkString(name)));
R_tryEval(e, R_GlobalEnv, NULL);
UNPROTECT(1);
}
/*
Call the function foo() with 3 arguments, 2 of which
are named.
foo(pch="+", id = 123, c(T,F))
Note that PrintValue() of the expression seg-faults.
We have to set the print name correctly.
*/
void
bar1()
{
SEXP fun, pch;
SEXP e;
PROTECT(e = allocVector(LANGSXP, 4));
fun = findFun(install("foo"), R_GlobalEnv);
if(fun == R_NilValue) {
fprintf(stderr, "No definition for function foo. Source foo.R and save the session.\n");
UNPROTECT(1);
exit(1);
}
SETCAR(e, fun);
SETCADR(e, mkString("+"));
SET_TAG(CDR(e), install("pch"));
SETCADDR(e, ScalarInteger(123));
SET_TAG(CDR(CDR(e)), install("id"));
pch = allocVector(LGLSXP, 2);
LOGICAL(pch)[0] = TRUE;
LOGICAL(pch)[1] = FALSE;
SETCADDDR(e, pch);
PrintValue(e);
eval(e, R_GlobalEnv);
SETCAR(e, install("foo"));
PrintValue(e);
R_tryEval(e, R_GlobalEnv, NULL);
UNPROTECT(1);
}
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