The set function style command changes the default plotting style for functions.
Syntax:
set function style
show function style
set function style <style-choice>
In the first case, set function style returns the possible style
choices: lines, points, linespoints, dots, steps,
impulses, errorbars, boxes, or boxerrorbars.
show function style shows the current default plotting style for
functions. set function style linespoints would actually change
the default plotting style. See also plot.