[Gnuplot-info] putting a dot on a graph or surface to mark a spot - how?

[Esmail <eb...@ho...>]

Hello all,

(just discovered this group)

I am plotting some graphs and surfaces using gnuplot using plot and
spot. These are functions that I am optimizing. So far so good.

What I would like to do, but don't know how, is to place some sort of
a marker or circle on the graph or the surface to indicate the maximum
location found. Ie I would draw the graph or surface first, and then
mark/superimpose a marker to show the maximum spot.

Is there a way to do this? I've been using gnuplot itself for
a while, but I have no idea how to do this.

Thanks,
Esmail

ps: I am mainly using gnuplot version 4.2 patchlevel 4 under Linux.