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--[[--
Simple math helper functions
]]
local bit = require("bit")
local Math = {}
local band = bit.band
function Math.roundAwayFromZero(num)
if num > 0 then
return math.ceil(num)
else
return math.floor(num)
end
end
function Math.round(num)
return math.floor(num + 0.5)
end
function Math.oddEven(number)
if band(number, 1) == 1 then
return "odd"
else
return "even"
end
end
local function tmin_max(tab, func, op)
if #tab == 0 then return nil, nil end
local index, value = 1, tab[1]
for i = 2, #tab do
if func then
if func(value, tab[i]) then
index, value = i, tab[i]
end
elseif op == "min" then
if value > tab[i] then
index, value = i, tab[i]
end
elseif op == "max" then
if value < tab[i] then
index, value = i, tab[i]
end
end
end
return index, value
end
--[[--
Returns the minimum element of a table.
The optional argument func specifies a one-argument ordering function.
@tparam table tab
@tparam func func
@treturn dynamic minimum element of a table
]]
function Math.tmin(tab, func)
return tmin_max(tab, func, "min")
end
--[[--
Returns the maximum element of a table.
The optional argument func specifies a one-argument ordering function.
@tparam table tab
@tparam func func
@treturn dynamic maximum element of a table
]]
function Math.tmax(tab, func)
return tmin_max(tab, func, "max")
end
return Math