Question

I am trying to plot multiple lists in the same plot in Mathematica (ListLinePlot) and use PlotMarkers and the PlotLegend Package to get the final figure. The issue is that Mathematica puts a marker for every point and this makes it hard to tell which marker is where in the plot. Is it possible to have a plot marker appear every n sample (e.g. every 10 points for a 100 point plot).

The Directive at the moment is PlotMarkers->{Automatic, Small}.

Answer 1

If you want more control over the location of the plot markers than Brett’s answer gives you, then you probably have to place the markers manually. Eg (modifying Brett’s example)

data = Accumulate /@ RandomReal[{-1/2, 1}, {3, 100}];
col = {Red, Blue, Green};
decimate[i_] := {col[[i]], PointSize -> Medium, 
  Point /@ Transpose[{Range[1, 100, 10], data[[i, 1 ;; -1 ;; 10]]}]}
ListLinePlot[data, PlotStyle -> col, Epilog -> Table[decimate[i], {i, 3}]]

Of course Point can be replaced with any graphics object you want – eg Text, Inset etc…