Create an array x=(2,2.3,2.6,...,4.7,5).
x = [2:5:.3]
Plot sqrt(x) vs. x as a line plot
set plotsymbol 0
graph x sqrt(x)

Plot sqrt(x) vs. x with disconnected plot symbols.
set plotsymbol -1
graph x sqrt(x)

Create arrays of numerical values
Define vectors (1-d arrays)