launch cactus

1 files changed, 11 insertions, 0 deletions

diff --git a/numutil.lua b/numutil.lua
new file mode 100644
index 0000000..ce212c4
--- /dev/null
+++ b/numutil.lua
@@ -0,0 +1,11 @@
+local function sign(x)
+	if x > 0 then return 1
+	elseif x < 0 then return -1
+	else return 0
+	end
+end
+
+
+return {
+	sign = sign,
+}