Randomly selects or deletes points/primitives by a given amount.
These SOPs show a VEX based approach on how to gather elements randomly. There are many ways to do this, but it gets tricky if you want a specific number of elements to be gathered.
https://www.dropbox.com/s/axpn2kk72qejae4/SelectRandom_SOP_Animatrix.otl?dl=1
https://www.dropbox.com/s/q8ubs99v385a524/DeleteRandom_SOP_Animatrix.otl?dl=1