Module:Math: Difference between revisions

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    m>Dragons flight
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    m>Dragons flight
    (unnecessary)
    Line 46: Line 46:
             if pos <= 0 then
             if pos <= 0 then
                 return 0
                 return 0
            end
                           
            if x:byte(pos) == string.byte('.') then
                pos = pos - 1
             end
             end
         end
         end

    Revision as of 05:59, 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 )
    
        -- Remove leading / trailing whitespace
        x = x:match "^%s*(.-)%s*$";
    
        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
        end
        
        return result
    end
    
    return z