Need to debug why it isn't working.

src/lib.rs

@@ -149,34 +149,7 @@ fn rate(rating_groups: &[&[Rating]]) {
         factor.start(&mut variable_arena);
     }
 
-    for factor in &skill_to_perf {
-        factor.update_value(&mut variable_arena);
-    }
-
-    for factor in &perf_to_team {
-        factor.update_sum(&mut variable_arena);
-    }
-
-    for factor in &team_diff {
-        factor.update_sum(&mut variable_arena);
-    }
-
-    for factor in &trunc {
-        factor.update(&mut variable_arena);
-    }
-
-    for factor in &team_diff {
-        factor.update_term(&mut variable_arena, 0);
-        factor.update_term(&mut variable_arena, 1);
-    }
-
-    for factor in &perf_to_team {
-        factor.update_term(&mut variable_arena, 0);
-    }
-
-    for factor in &skill_to_perf {
-        factor.update_mean(&mut variable_arena);
-    }
+    println!("before:");
 
     for i in 0..size {
         let value = variable_arena
@@ -187,7 +160,52 @@ fn rate(rating_groups: &[&[Rating]]) {
         let mu = value.mu();
         let sigma = value.sigma();
 
-        println!("player={}, mu={}, sigma={}", i, mu, sigma);
+        println!("* player={}, mu={}, sigma={}", i, mu, sigma);
+    }
+
+    for factor in &skill_to_perf {
+        factor.update_value(&mut variable_arena);
+    }
+
+    for factor in &perf_to_team {
+        factor.update_sum(&mut variable_arena);
+    }
+
+    for _ in 0..5 {
+        for factor in &team_diff {
+            factor.update_sum(&mut variable_arena);
+        }
+
+        for factor in &trunc {
+            factor.update(&mut variable_arena);
+        }
+
+        for factor in &team_diff {
+            factor.update_term(&mut variable_arena, 0);
+            factor.update_term(&mut variable_arena, 1);
+        }
+    }
+
+    for factor in &perf_to_team {
+        factor.update_term(&mut variable_arena, 0);
+    }
+
+    for factor in &skill_to_perf {
+        factor.update_mean(&mut variable_arena);
+    }
+
+    println!("after:");
+
+    for i in 0..size {
+        let value = variable_arena
+            .get(ss[i])
+            .map(|variable| variable.get_value())
+            .unwrap();
+
+        let mu = value.mu();
+        let sigma = value.sigma();
+
+        println!("* player={}, mu={}, sigma={}", i, mu, sigma);
     }
 }
 
@@ -264,7 +282,7 @@ mod tests {
             sigma: SIGMA,
         };
 
-        assert_eq!(quality(&[&[alice], &[bob]]), 0.41614607);
+        assert_eq!(quality(&[&[alice], &[bob]]), 0.41614606763952605);
     }
 
     #[test]
@@ -279,6 +297,9 @@ mod tests {
             sigma: SIGMA,
         };
 
+        // alice: mu=27.175, sigma=7.112
+        // bob:   mu=23.141, sigma=6.859
+
         rate(&[&[alice], &[bob]]);
 
         assert_eq!(true, false);