In Lua, what is #INF and #IND?

Question

I\'m fairly new to Lua. While testing I discovered #INF/#IND. However, I can\'t find a good reference that explains it.

What are #INF

Answer 1

@YuHao has already pointed out what means +/-1.#INF (+-inf) and -1.#IND (nan), so I will just add how to deal with it (which I just needed to) in Lua:

• "inf" (+/- 1.#INF) are the higher number values that (Lua/C) can represent and the language provides that constant for you: "math.huge". So you can test a number inside Lua for +-INF; the function "isINF()" below shows how to use it.
• "nan" (- 1.#IND) is something that can not be handled numerically: it should be a number, its not, and anything you do with it is anything but a number also. with that in mind remember that no NaN is equal to other NaN; check for NaN like the function "isNAN()" below.

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local function isINF(value)
  return value == math.huge or value == -math.huge
end

local function isNAN(value)
  return value ~= value
end

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