The line command creates a plot data object, which when displayed is a line segment starting at point a and ending at point b. The line is two- or three-dimensional depending on whether a is a list of two or three values, respectively.

The plot data object produced by the line command can be used in a PLOT or PLOT3D data structure, or displayed using the plots[display] command.

Remaining arguments are interpreted as options, which are specified as equations of the form option = value.  For more information, see plottools, plot/options and plot3d/options.