Create Unit-Type In A Random Region That Has No Units?

i have 650 small, evenly placed regions that is layed out much like a chess-board.


I have each region set to a region variable [integer a] 1-650

Now, my problem is i want to create 270 of this one kind of unit in 270 of the 650 regions, randomly picked... we'll say he is a Peon unit-type.

Also, there are existing Neutral Creeps on the map to concider, scattered randomly that could be within any given region at any time because they have the "wander" ability. I dont want those regions concidered that have these, or any units already there.

How do i create 1 unique Peon per 1 random region that has no units currently within it...

my problem is that when i do this, it sometimes randomly chooses the same region that already has a peon generated for it.

and when i try a different way to get 1 peon per 1 region it ends up selecting the regions in an orderly fashion .. which i dont want. this needs to be completely random.

Summary:
I want it so that out of 650 regions, 270 of them are randomly chosen to have 1 peon in each and no other unit at the time of creation.

Check if the region has a unit in it. If it does, then get a new random region. Rinse and repeat.

You may want to use a boolean array so you don't have to keep checking if a unit exists (which is slower than a boolean check).

If this is related to your random number thread, then use that method instead.

Here is what i have so far.. and it lags like hell because 650 + 270 * 650 = 176150 checks in one trig.. and it tends to stop on the 4th loop on the integera A on the 1-270 checks.

(Note: i switched the peons to barrels)
first i do:


i do the rechecks with the integer b loop with the intention of it rechecking the newly created barrel (peon). yet it still seems to try to create in too orderly of a fashion and sometimes creates more than one in the same region.
i just dont get it!

I think you're hitting the operator limit and that could be hindering your trigger.