Question

help with Greatest Interger Function:
Graph f: x -> [x] U={ x: -5 ≤x≤5, x element of R}

Answer 1

This may be helps you,
http://www.wolframalpha.com/input/?i=Plot [IntegerPart[x]%2C+{x%2C+0%2C+5}]&dataset=
Remember that the function must be right-continuous.