-- To plot points, make a list of 3 or more x,y coordinate pairs.
xy = {
{1, 2.3},
{2, 4.1},
{3, 6.4},
{4, 3.0},
{5, 1.5} }

plot xy
plotline xy  -- To connect the points, use "plotline"

-- You can also plot a list of y values evenly spaced along x
ys = {1,2,3,4,5,6,7,6,5,4,3,2,1}
plot ys      -- (triangle markers)

-- Lists of points can be read from a separate file using read(). See the doc files "Datafiles" and "Plotting" for more information.