Difference between revisions of "Module:Decimals"
(Undid revision 671492526 by Alakzi (talk): This results in errors being silently suppressed, rather than doing anything to actually fix them.) |
m (1 revision imported) |
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Latest revision as of 17:12, 31 January 2018
 | This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing. |
Usage
From other Lua modules
local roundAndPad = require('Module:Decimals')._main
result = roundAndPad(n, decimals)
From wikitext
{{#invoke:Decimals|main|n|decimals}}
For more information, see Template:Decimals.
require('Module:No globals')
local p = {}
function p._main(n, d)
local num = tonumber(n)
if not num then
error('Unable to convert "' .. tostring(n) .. '" to a number')
end
local decimals = tonumber(d)
if not decimals then
error('Unable to convert "' .. tostring(d) .. '" to a number')
end
local maxDecimals = 14 - math.floor(math.log10(num)) -- to allow a maximum of 15 significant figures, which is the highest guaranteed correct with doubles
if decimals > maxDecimals then decimals = maxDecimals end
local mult = 10^decimals
num = math.floor(num * mult + 0.5) / mult
if decimals < 0 then
return tostring(num)
else
return string.format('%.' .. decimals .. 'f', num)
end
end
function p.main(frame)
local args, pargs = frame.args, frame:getParent().args
return p._main(mw.ext.ParserFunctions.expr(args[1] or pargs[1]), mw.ext.ParserFunctions.expr(args[2] or pargs[2]))
end
return p
