Hi all,

I have a program where I store 4 Arraylists of floats that are positions of pixels, namely

x_List_ex,    y_List_ex,

and

x_List,           y_List.

They contain points of pixels on screen which are being stored in the respective Arraylists ,
x_List_ex is in conjuction with y_List_ex, referring to saved pixels that we want to delete and
x_List is in conjunction with y_List as before.

What I want to happen is :
1) compare x_List_ex and x_List,
2) get their common elements, and their indices,
3) delete those elements from x_List_ex after getting the indices,
4) based on those saved indices,  delete the according elements from y_List_ex.

I haven't managed to tackle it yet, the tricky part for me is when I try to find the indices, but I've been having problems in general.

Any help would be greately appreciated ;)

Should anyone need any further explanations, let me know

Cheers