Sometimes simple things can be very hard to do. For instance plotting a single point with gnuplot. Luckily, there are two horrible hacks which allow you to accomplish this from the gnuplot prompt (putting the point’s coordinates in a file is of course just the easy way out…).
gnuplot> plot “< echo ‘x y’”
(Set x and y to your point’s x and y coordinate)
gnuplot> plot “-” (press shift enter)
x y (press enter)