Plot only every n'th dot, change from figure menu without extracting the data

I have a figure with many curves on it. I wish to change the frequency of the dots only for some of the curves. Is there a way to do this directly (and simply) from the figure menum or the properties of the curve? Namely without having to extract the data into arrays (I only have the figure, not the original *.mat file)?

Answer 1

[Ameer Hamza]

Yes, you can do that uses axes and line handles. For example, open the figure and run

ax = gca

it will give you the axes handle. If you then try

ax.Children

you will see an array of lines like this

ans = 
  2×1 Line array:
  Line
  Line

You can then change the XData and YData of each line individually. For example, to delete even index elements from the first line, try

ax.Children(1).XData(2:2:end) = [];
ax.Children(1).YData(2:2:end) = [];

Answer 2

[Steven Lord]

If you're using release R2016b or later, use the findobj or findall functions to find the handle of the object created by plot then set the MarkerIndices property of that handle or those handles.