How do I find values close to a given value?

Question

I have data = [1 1.2 1.3 1.5 1.8]

I want to find closest values before and after from data for this point, b = 1.23

How do I do th

Answer 1

data = [1 1.2 1.3 1.5 1.8]

b = 1.23

find(abs(data-b)==min(abs(data-b)))