week 11 sloan ordering

doc/ordering/pgr_sloanOrdering.rst

@@ -40,6 +40,7 @@ The Sloan ordering algorithm reorders the vertices of a graph to reduce bandwidt
   *Aims to mininimize bandwidth (maximum difference between connected vertex indices.
   *The implementation is for undirected graphs
   *Typically produces better orderings than simple breadth-first approaches.
+  *Run time is 0.115846 seconds.
 |Boost| Boost Graph inside
 
 Signatures

docqueries/ordering/sloanOrdering.pg

@@ -6,3 +6,41 @@ SELECT * FROM pgr_sloanOrdering(
   );
 /* -- q2 */
 
+CREATE TABLE example_edges1 (
+    id SERIAL PRIMARY KEY,
+    source INTEGER,
+    target INTEGER,
+    cost DOUBLE PRECISION,
+    reverse_cost DOUBLE PRECISION
+);
+/* --q3 */
+INSERT INTO example_edges1 (source, target, cost, reverse_cost) VALUES
+(4, 7, 1, 1),
+(7, 4, 1, 1),
+(7, 9, 1, 1),
+(9, 7, 1, 1),
+(7, 0, 1, 1),
+(0, 7, 1, 1),
+(0, 2, 1, 1),
+(2, 0, 1, 1),
+(2, 5, 1, 1),
+(5, 2, 1, 1),
+(5, 9, 1, 1),
+(9, 5, 1, 1),
+(9, 8, 1, 1),
+(8, 9, 1, 1),
+(9, 1, 1, 1),
+(1, 9, 1, 1),
+(5, 1, 1, 1),
+(1, 5, 1, 1),
+(9, 6, 1, 1),
+(6, 9, 1, 1),
+(6, 3, 1, 1),
+(3, 6, 1, 1),
+(1, 3, 1, 1),
+(3, 1, 1, 1);
+/* --q4 */
+SELECT * FROM pgr_sloanOrdering(
+    'SELECT id, source, target, cost, reverse_cost FROM example_edges1'
+);
+/* --q5 */

docqueries/ordering/sloanOrdering.result

@@ -10,23 +10,77 @@ SELECT * FROM pgr_sloanOrdering(
 -----+------
    1 |    1
    2 |    3
-   3 |    6
-   4 |    5
-   5 |   10
+   3 |    8
+   4 |    9
+   5 |   12
    6 |    7
-   7 |    9
-   8 |   15
-   9 |    8
+   7 |    5
+   8 |   17
+   9 |    6
   10 |   11
   11 |   16
-  12 |   12
-  13 |   17
+  12 |   10
+  13 |   15
   14 |    1
   15 |    1
   16 |    1
   17 |    1
 (17 rows)
 
 /* -- q2 */
+CREATE TABLE example_edges1 (
+    id SERIAL PRIMARY KEY,
+    source INTEGER,
+    target INTEGER,
+    cost DOUBLE PRECISION,
+    reverse_cost DOUBLE PRECISION
+);
+CREATE TABLE
+/* --q3 */
+INSERT INTO example_edges1 (source, target, cost, reverse_cost) VALUES
+(4, 7, 1, 1),
+(7, 4, 1, 1),
+(7, 9, 1, 1),
+(9, 7, 1, 1),
+(7, 0, 1, 1),
+(0, 7, 1, 1),
+(0, 2, 1, 1),
+(2, 0, 1, 1),
+(2, 5, 1, 1),
+(5, 2, 1, 1),
+(5, 9, 1, 1),
+(9, 5, 1, 1),
+(9, 8, 1, 1),
+(8, 9, 1, 1),
+(9, 1, 1, 1),
+(1, 9, 1, 1),
+(5, 1, 1, 1),
+(1, 5, 1, 1),
+(9, 6, 1, 1),
+(6, 9, 1, 1),
+(6, 3, 1, 1),
+(3, 6, 1, 1),
+(1, 3, 1, 1),
+(3, 1, 1, 1);
+INSERT 0 24
+/* --q4 */
+SELECT * FROM pgr_sloanOrdering(
+    'SELECT id, source, target, cost, reverse_cost FROM example_edges1'
+);
+ seq | node
+-----+------
+   1 |    4
+   2 |    0
+   3 |    2
+   4 |    7
+   5 |    8
+   6 |    5
+   7 |    9
+   8 |    3
+   9 |    1
+  10 |    6
+(10 rows)
+
+/* --q5 */
 ROLLBACK;
 ROLLBACK

src/ordering/ordering_driver.cpp

@@ -89,9 +89,15 @@ do_ordering(
 
         std::vector<int64_t> results;
 
+#if 0
         pgrouting::UndirectedGraph undigraph;
+#else
+        auto vertices(pgrouting::extract_vertices(edges));
+        pgrouting::UndirectedGraph undigraph(vertices);
+#endif
         undigraph.insert_edges(edges);
 
+        // log << undigraph;
         if (which == 0) {
                 results = sloanOrdering(undigraph);
         }