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edits
Module:Number: Difference between revisions
From Melvor Idle
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end | end | ||
--- Rounds a number to a specified number of digits after the decimal point. | |||
-- @param val (number or string) The value to round. | |||
-- @param maxDigits (number) [optional] The maximum number of digits after the decimal point. | |||
-- @param minDigits (number) [optional] The minimum number of digits after the decimal point. | |||
-- @return (string) The rounded number with the specified number of digits after the decimal point, or the input unchanged if it's not a number. | |||
function p.round(val, maxDigits, minDigits) | |||
if val == nil then | |||
return nil | |||
else | |||
if type(maxDigits) == "table" then | |||
minDigits = maxDigits[2] | |||
maxDigits = maxDigits[1] | |||
end | |||
local result = val.."" | |||
local decimals = string.find(result, "%.") | |||
if decimals ~= nil then | |||
decimals = string.len(result) - decimals | |||
else | |||
decimals = 0 | |||
end | |||
if maxDigits ~= nil and decimals > maxDigits then | |||
result = string.format("%."..maxDigits.."f", result) | |||
elseif minDigits ~= nil and decimals < minDigits then | |||
result = string.format("%."..minDigits.."f", result) | |||
end | |||
return result | |||
end | |||
end | |||
--- Rounds a number to a specified number of decimal places. | |||
-- @param num (number) The number to round. | |||
-- @param numDecimalPlaces (number) [optional] The number of decimal places to round to. | |||
-- @return (number) The rounded number with the specified number of decimal places, or the nearest integer if numDecimalPlaces is not provided. | |||
--From http://lua-users.org/wiki/SimpleRound | |||
function p.round2(num, numDecimalPlaces) | |||
local mult = 10^(numDecimalPlaces or 0) | |||
return math.floor(num * mult + 0.5) / mult | |||
end | |||
-- Euclidean Greatest Common Divisor algorithm | |||
function p.gcd(a, b) | |||
if b ~= 0 then | |||
return p.gcd(b, a % b) | |||
else | |||
return math.abs(a) | |||
end | |||
end | |||
--Formats a pair of numbers as a reduced fraction | |||
function p.fraction(n, d) | |||
local gcd = p.gcd(n, d) | |||
return p.formatnum(n/gcd)..'/'..p.formatnum(d/gcd) | |||
end | |||
--Similar to p.fraction but returns the simplified numerator and denomerator separately without formatting | |||
function p.fractionpair(n, d) | |||
local gcd = p.gcd(n, d) | |||
return n / gcd, d / gcd | |||
end | |||
--Returns a number including the sign, even if positive | |||
function p.numStrWithSign(number) | |||
if number >= 0 then | |||
return '+'..p.formatnum(number) | |||
else | |||
return p.formatnum(number) | |||
end | |||
end | |||
--- Clamps a value between a minimum and maximum range. | --- Clamps a value between a minimum and maximum range. | ||
