Why Do I keep getting NaNs in my code???

I have posted the full code but I generally do not umderstand why??

[per isakson]

Did you remove the code?

Answer 1

[Muhtasim Haque Nahian]

NaN stands for Not a Number. If your variable/matrix/input does not have the specific number/range that should meet the argument, NaN will appear as an output.

https://en.wikipedia.org/wiki/NaN

Hope this helps!