====== advtrains.abs_ceil ======
//Rounds a number away from zero.//

//Notes://
  * //this page has been written for Advtrains 2.0.1 TSS and Minetest 5.1.0. Examples and practices described in this page don't take advantage of improvements introduced in later releases.//
  * //''math.sign'' is not available in all Lua versions. See this [[https://stackoverflow.com/questions/1318220/lua-decimal-sign|Stack Overflow question]] for more details.//

===== Syntax =====
<code lua>
advtrains.abs_ceil(i)
</code>

===== Parameters =====
  * ''i'' //(number)//: a number.

===== Returns =====
The specified argument rounded away from zero.

===== Examples =====
<code lua>
advtrains.abs_ceil(3) -- 3
advtrains.abs_ceil(3.1) -- 4
advtrains.abs_ceil(3.5) -- 4
advtrains.abs_ceil(3.9) -- 4

advtrains.abs_ceil(-3) -- -3
advtrains.abs_ceil(-3.1) -- -4
advtrains.abs_ceil(-0.00001) -- -1
advtrains.abs_ceil( 0.00001) --  1
</code>

===== In source code =====
advtrains/helpers.lua, lines 186 to 188:

<file lua abs_ceil.lua>
function advtrains.abs_ceil(i)
    return math.ceil(math.abs(i))*math.sign(i)
end
</file>