Grabbing points from scatter plot

I have 2 matrices and i plotted them on a scatter plot and i would like to highlight some points from the plot and discard all the other data points from the matrices i generated the scatter plot from. Is this possible.

e.g my plot is made out of 1000 data points and i would like to select 25 points from the plot and discard all the other data points from the matrices with the data.

Really Sorry if this is not possible or not clear

[Geoff Hayes]

Ahmed - how do you plan to select the 25 points to keep?

Answer 1

[Ameer Hamza]

This shows how you can randomly select points from the complete dataset

x = rand(1000, 1);
y = rand(1000, 1);

idx = randperm(1000, 25); % randomly select 25 points

scatter(x(idx), y(idx))