symbolevery

The command symbolevery n instructs plotl to only put symbols on every nth point. The default is to put a symbol on each point (that is, symbolevery 1).

This command is useful when the nuber of points plotted is large enough that putting a symbol on each one would clutter the figure.

plotevery

The command plotevery n instructs plotl to only plot every nth point. The default is to plot every point (that is, plotevery 1).