Module:Math: Difference between revisions
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en>Dragons flight (whitespace) |
en>Dragons flight (unnecessary) |
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if pos <= 0 then |
if pos <= 0 then |
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return 0 |
return 0 |
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end |
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if x:byte(pos) == string.byte('.') then |
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pos = pos - 1 |
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end |
end |
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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