Module:Math: Difference between revisions

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    m>Dragons flight
    (add max and min)
    Line 1: Line 1:
    local z = {}
    local z = {}


    -- Generate random number
    function z.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
    Line 52: Line 53:
    end
    end


    -- Finds maximum argument
    function z.max( frame )
        if frame.args[1] == nil then
            return ''
        end
        local max_value = tonumber( frame.args[1] )
       
        local i = 2;
        while frame.args[i] ~= nil do
            local val = tonumber( frame.args[i] );
            if val ~= nil then
                if val > max_value then
                    max_value = val;
                end
            end       
            i = i + 1;
        end
     
        return max_value
    end
    -- Finds minimum argument
    function z.min( frame )
        if frame.args[1] == nil then
            return ''
        end
        local min_value = tonumber( frame.args[1] )
       
        local i = 2;
        while frame.args[i] ~= nil do
            local val = tonumber( frame.args[i] );
            if val ~= nil then
                if val < min_value then
                    min_value = val;
                end
            end       
            i = i + 1;
        end
     
        return min_value
    end
    return z
    return z

    Revision as of 17:06, 21 February 2013

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

    local z = {}
    
    -- Generate random number
    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_pos = string.find( x, 'E', 1, true )
        local result = 0;
        
        if exponent_pos ~= nil then
            local exponent = string.sub( x, exponent_pos + 1 )
            x = string.sub( x, 1, exponent_pos - 1 )
            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
    
    -- Finds maximum argument
    function z.max( frame )
        if frame.args[1] == nil then
            return ''
        end
        local max_value = tonumber( frame.args[1] )
        
        local i = 2;
        while frame.args[i] ~= nil do
            local val = tonumber( frame.args[i] );
            if val ~= nil then
                if val > max_value then
                    max_value = val;
                end
            end        
            i = i + 1;
        end
      
        return max_value
    end
    
    -- Finds minimum argument
    function z.min( frame )
        if frame.args[1] == nil then
            return ''
        end
        local min_value = tonumber( frame.args[1] )
        
        local i = 2;
        while frame.args[i] ~= nil do
            local val = tonumber( frame.args[i] );
            if val ~= nil then
                if val < min_value then
                    min_value = val;
                end
            end        
            i = i + 1;
        end
      
        return min_value
    end
    return z