Made find_clusters_using_kmeans() work with dlib::vector objects.

dlib/svm/kkmeans.h

@@ -405,7 +405,7 @@ namespace dlib
         typedef typename sample_type::type scalar_type;
 
         sample_type zero(centers[0]);
-        zero = 0;
+        set_all_elements(zero, 0);
 
         std::vector<unsigned long, alloc> center_element_count;
 

dlib/test/kmeans.cpp

@@ -47,6 +47,8 @@ namespace
         std::vector<sample_type> centers;
         pick_initial_centers(seed_centers.size(), centers, samples, linear_kernel<sample_type>());
 
+        find_clusters_using_kmeans(samples, centers);
+
         DLIB_TEST(centers.size() == seed_centers.size());
 
         std::vector<int> hits(centers.size(),0);
@@ -95,6 +97,17 @@ namespace
 
                 run_test(seed_centers);
             }
+            {
+                dlog << LINFO << "test dlib::vector<double,2>";
+                typedef dlib::vector<float,2> sample_type;
+                std::vector<sample_type> seed_centers;
+                seed_centers.push_back(sample_type(10,10));
+                seed_centers.push_back(sample_type(10,-10));
+                seed_centers.push_back(sample_type(-10,10));
+                seed_centers.push_back(sample_type(-10,-10));
+
+                run_test(seed_centers);
+            }
             {
                 dlog << LINFO << "test dlib::matrix<double,3,1>";
                 typedef dlib::matrix<double,3,1> sample_type;