[R] Compiling third party C++ libraries

[Samuel Kemp]

Hi,

Does anyone know how to compile C++ code that uses 3rd party C++ 
libraries, so that the .so file can be used in R?

I keep getting errors when using dyn.load which say undefined reference 
to KdSpiltRule, which is in my third party library.

Here is the entire code......

// Computes a rapid Gamma test using ANN (Approximate Near Neighbour) 
library

#include <stdio.h>                                                    
                   // C I/O
#include <string.h>                                                    
                   // string manipulation
#include <math.h>                                                        
               // math routines
#include "/home/sekemp/ann_0.2/include/ANN/ANN.h"            // ANN 
declarations

extern "C"
{
void rapidGammaTest(double *inputs, double *outputs, int *dim, int 
*n_pts, int *k, double *sum)
{
   ANNpointArray    data_pts;        // data points
   ANNpoint                query_pt;        // query point
   ANNidxArray        nn_idx;            // near neighbor indices
   ANNdistArray        dists;            // near neighbor distances
   ANNkd_tree        *the_tree;        // search structure

   query_pt = annAllocPt(*dim);            // allocate query point
   data_pts = annAllocPts(*n_pts, *dim);        // allocate data points
   nn_idx = new ANNidx[*k];            // allocate near neigh indices
   dists = new ANNdist[*k];            // allocate near neighbor dists
  
   int inc = 0;
   for(int i = 0; i < *n_pts; i++)
   {
       ANNpoint p;
       for(int j = 0; j < *dim; j++)
       {
           p[j] = inputs[inc];
           inc++;
       }
       data_pts[i] = p;
   }
  
   int bs    =    32;
   int M      = *n_pts;
   int n_NN         = *k;
   the_tree = new ANNkd_tree(        // build search structure
           data_pts,                                // the data points
           M,                                        // number of points
           n_NN,                                    // dimension of space
           bs);                                        // bucket size
  
   for(int t = 0; t < n_NN; t++)
   {
       sum[t] = 0.00;
   }
  
   for(int j = 0; j < M; j++)
   {
       the_tree->annkSearch(            // search
                       data_pts[j],                    // query point
                       n_NN,                                // number 
of near neighbors
                       nn_idx,                        // nearest 
neighbors (returned)
                        dists);                        // distance 
(returned)

       for (int g = 0; g < n_NN; g++)
       {
               sum[g] += pow(sqrt(dists[g]), 2);
       }
   }
}
}
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