Hello, i am using Arduino Mega to comunicate with another devices with RF, I need to use a serial interruption in Mega, because I need to save in a vector array, somebody can help me?
Your question doesn't make sense.
What does a serial interrupt have to do with saving an array?
Tell us more.
Have a look at the examples in Serial Input Basics - simple reliable ways to receive data.
...R
Please explain what you're actually trying to do. A complete picture of the problem you're trying to solve, not the solution you're trying to implement (which may or may not be a good solution in the first place).