From 66315d0219a1a43e5a1b7e86626804c36cd02a64 Mon Sep 17 00:00:00 2001
From: Lars Mueller <appgurulars@gmx.de>
Date: Wed, 12 Jan 2022 12:16:55 +0100
Subject: [PATCH] Add vector.normalize_zero

---
 vector.lua | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/vector.lua b/vector.lua
index c376601..7274ac3 100644
--- a/vector.lua
+++ b/vector.lua
@@ -162,6 +162,19 @@ function normalize(v)
 	return divide_scalar(v, length(v))
 end
 
+function normalize_zero(v)
+	local len = length(v)
+	if len == 0 then
+		-- Return a zeroed vector with the same keys
+		local zeroed = {}
+		for k in pairs(v) do
+			zeroed[k] = 0
+		end
+		return new(zeroed)
+	end
+	return divide_scalar(v, len)
+end
+
 function floor(v)
 	return apply(v, math.floor)
 end