From bc0630b4ae6adc35f5c037c65ad0500f45897e21 Mon Sep 17 00:00:00 2001
From: Robert Garrett <robertgarrett404@gmail.com>
Date: Wed, 3 Sep 2025 14:09:40 -0500
Subject: [PATCH] Fix: off-by-one error in `alignment` averaging

The "length" is actually the `enumerate()` index, which is one less than
the item count. The previous version was not using the average, and may
have been deviding by 0 for boids with exactly one neighbor.
---
 src/birdoids/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/birdoids/mod.rs b/src/birdoids/mod.rs
index 5395f993..a530c203 100644
--- a/src/birdoids/mod.rs
+++ b/src/birdoids/mod.rs
@@ -251,7 +251,7 @@ fn alignment(
 
         // Skip to next boid if the current one has no neighbors.
         let avg = if len > 0 {
-            sum / (len as f32)
+            sum / ((len + 1) as f32)
         } else {
             continue;
         };