Another way to graph a function in dot mode is to change the mode setting for the calculator to Dot. This will affect ALL graphs that are defined in the function editor. If you only want to change the graph for an individual function, use the dot style.
To change the mode setting to Dot, press:
[Dot]
If you check the function editor, you will notice that each function is now set to the dot style.
To change the mode setting back to Connected mode (the default), press:
[Connected]