FFT codec problem


I have a project that requires an FFT codec. I found them downloaded them but they would

not compile, could not find FFT.h. I checked, it's in the library. I also went back and made sure

the program was in the right dir. Can any one help? Also if I delete a sketch will it remove it

from my UNO?


You should provide more information to get help.
We cannot see your code or where you downloaded it from.

An sketch stays intact on an UNO until another one is uploaded.
You cannot get C/C++ source code back from the UNO