Check if number is NaN or inf

Solar2D Lua Language
#1

Hello,

I’m wondering if there is any method to check if the number is NaN or inf?

I tried the following to no avail:

if VALUE == "nan" then print("this is not a number") end ------------------------------ if VALUE == "inf" then print("this is infinite number") end

Is there such thing as:

math.isNan() or math.isINF() ?

Thanks for your help!

#2

For seeing if a value is a number:

if type(value) == "number" then -- do something end

For inf, perhaps:

if value == math.huge then -- do something end
#3

Thanks for the suggestion.

The check for inf works flawlessly, however for NaN it is not working as I expected.

It only check if the type is number which is fine if I’m checking against string, but it wouldn’t tell me its nan

Found out a post at: http://snippets.luacode.org/snippets/Test_for_NaN_75

function isnan(x) return x ~= x end

To check if the number is NaN (not a number)

if isnan(value) == true then -- do something end
#4

Good point, my apologises. I kind of skimmed through your question before answering.

#5

For seeing if a value is a number:

if type(value) == "number" then -- do something end

For inf, perhaps:

if value == math.huge then -- do something end
#6

Thanks for the suggestion.

The check for inf works flawlessly, however for NaN it is not working as I expected.

It only check if the type is number which is fine if I’m checking against string, but it wouldn’t tell me its nan

Found out a post at: http://snippets.luacode.org/snippets/Test_for_NaN_75

function isnan(x) return x ~= x end

To check if the number is NaN (not a number)

if isnan(value) == true then -- do something end
#7

Good point, my apologises. I kind of skimmed through your question before answering.