How to determine a value within a range?

Hi,

I have a .txt file with a variety of diameters, and I am trying to find out how many diameters lie between the values 100 and 500 m. How can I do this?

Answer 1

[Azzi Abdelmalek]

A=randi(1000,1,100)
out=sum(A>=100 & A<=500)