Jacob,
Yep! That did it. Thank you very much!
TJB
On Thursday, 31 May 2012 at 06:19:34 UTC, Jacob Carlborg wrote:
On 2012-05-30 21:20, TJB wrote:
Hello!
I am still wet behind the ears with D. I am trying to
interface to an
existing C library from the R standalone math library
(www.r-project.org). I can call the library quite easily from
a C++
program as follows:
#include <iostream>
#include <time.h>
#define MATHLIB_STANDALONE
#include "Rmath.h"
using namespace std;
int main() {
int i, n;
double sum, x;
time_t tt;
tt = time(NULL);
set_seed(tt, 77911);
cout << "How many random normals to find the mean? ";
cin >> n;
sum = 0.0;
for(i = 0; i < n; i++) {
sum += rnorm(0, 1);
}
cout << "mean is " << sum/n << endl;
return 0;
}
I can compile this with:
$ g++ -o rnorm rnorm.cpp -I /usr/include -L /usr/lib -lRmath
-lm
When I grep rnorm from the Rmath.h header file I get:
$ grep rnorm Rmath.h
#define rnorm Rf_rnorm
double rnorm(double, double);
I have written D code to call this as follows:
import std.stdio;
extern (C) double rnorm(double, double);
void main() {
writeln(myfunc(0.0, 1.0));
}
double myfunc(double a, double b) {
return rnorm(a, b);
}
But I don't know what I need to do to compile it. What flags
do I add?
What else do I have to do?
Thanks for your help!
You just need to link to the external libraries.
$ dmd rnorm.d -L-L/usr/lib -L-lRmath -L-lm
