[algo] Drop math functions (moved to mathx)

algo.lua

@@ -5,25 +5,10 @@
 -- @author Lorenzo Cogotti
 
 local floor = math.floor
-local min, max = math.min, math.max
 
 local algo = {}
 
 
---- Clamp x within range [a,b] (where b >= a).
---
--- @number x value to clamp.
--- @number a interval lower bound (inclusive).
--- @number b interval upper bound (inclusive).
--- @treturn number clamped value.
-function algo.clamp(x, a, b) return min(max(x, a), b) end
-
---- Sign function.
---
--- @number x value whose sign should be returned.
--- @treturn number sign of x, -1 if negative, 1 if positive, 0 otherwise.
-function algo.sign(x) return x > 0 and 1 or x < 0 and -1 or 0 end
-
 --- Fast remove from array.
 --
 -- Replace 'array[i]' with last array's element and