check if a value is NaN

[IIYAMA]

What is the best way to detect a NaN value?

I found this: (but it doesn't seems to work, I still get warnings in the rest of the code when I check it like that)

function isnan(x) return x ~= x end 

[GTX]

This should work fine.

  
-- Source: [url=http://stackoverflow.com/questions/12102222/how-to-test-for-1-ind-indeterminate-in-lua#answer-12103118]http://stackoverflow.com/questions/1210 ... r-12103118[/url] 
local function isnan(x) 
    if (x ~= x) then 
        return true 
    end 
    if type(x) ~= "number" then 
       return false 
    end 
    if tostring(x) == tostring((-1)^0.5) then 
        return true 
    end 
    return false 
end 

[IIYAMA]

thx, I will try.

[ixjf]

What is it for? Are you sure you shouldn't be validating the input, rather than working around bad output?

[IIYAMA]

This function returns somtimes NaN https://wiki.multitheftauto.com/wiki/Ge ... ldPosition in combination with https://wiki.multitheftauto.com/wiki/GetPedTargetEnd

There is not much I can do about it Afaik. Also I get sometimes NaN values when I am playing around with vectors of my serverside bullet collision system. (checking the distance between 2 lines in 3D)