Module:Math: Difference between revisions

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imported>Banaticus
(created random module)
 
imported>Dragons flight
(Add precision calculation)
Line 1: Line 1:
local mathy = {}
local z = {}


function mathy.random( frame )
function z.random( frame )
     first = tonumber(frame.args[1]) -- if it doesn't exist it's NaN, if not a number it's nil
     first = tonumber(frame.args[1]) -- if it doesn't exist it's NaN, if not a number it's nil
     second = tonumber(frame.args[2])
     second = tonumber(frame.args[2])
Line 13: Line 13:
     return math.random()
     return math.random()
end
end
function z.precision( frame )
    return z._precision( frame.args[1] or frame.args.x or '0' )
end
-- Determines precision of a number using the string representation
function z._precision( x )
    x = string.upper( x )
   
    local decimal = string.find( x, '.', 1, true )
    local exponent = string.find( x, 'E', 1, true )
    local result = 0;
   
    if exponent ~= nil then
        exponent = string.sub( x, exponent + 1 )
        x = string.sub( x, 0, exponent )
        result = result - tonumber( exponent )
    end   
   
    if decimal ~= nil then
        result = result + string.len( x ) - decimal
        return result
    end
       
    local pos = string.len( x );
    while x:byte(pos) == string.byte('0') do
        pos = pos - 1
        result = result - 1
        if pos <= 0 then
            return 0
        end
                       
        if x:byte(pos) == string.byte('.') then
            pos = pos - 1
        end
    end
   
    return result
end
return z

Revision as of 05:40, 21 February 2013

Documentation for this module may be created at Module:Math/doc

local z = {}

function z.random( frame )
    first = tonumber(frame.args[1]) -- if it doesn't exist it's NaN, if not a number it's nil
    second = tonumber(frame.args[2])

    if first then -- if NaN or nil, will skip down to final return
        if first <= second then -- could match if both nil, but already checked that first is a number in last line
            return math.random(first, second)
        end
        return math.random(first)
    end   
    return math.random()
end

function z.precision( frame )
    return z._precision( frame.args[1] or frame.args.x or '0' )
end

-- Determines precision of a number using the string representation
function z._precision( x )
    x = string.upper( x )
    
    local decimal = string.find( x, '.', 1, true )
    local exponent = string.find( x, 'E', 1, true )
    local result = 0;
    
    if exponent ~= nil then
        exponent = string.sub( x, exponent + 1 )
        x = string.sub( x, 0, exponent )
        result = result - tonumber( exponent )
    end    
    
    if decimal ~= nil then
        result = result + string.len( x ) - decimal
        return result
    end
        
    local pos = string.len( x );
    while x:byte(pos) == string.byte('0') do
        pos = pos - 1
        result = result - 1
        if pos <= 0 then
            return 0
        end
                        
        if x:byte(pos) == string.byte('.') then
            pos = pos - 1
        end
    end
    
    return result
end

return z