[Math] Assign Unique Id

[~GaLs~]

Now, I have a 8x8 grid.
How do I assign an unique id to each of the squares? What formula to use?
*I need a formula that can return a unit number of each squares which is less than 8191.

 

[No_exit]

(x - 1) + 8 * (y - 1)

This will go from 0 to 65 which is the best you can do.

So the location (3,7) would be
(3 - 1) + 8 * (7 - 1) = 50.

edit: If you increase your grid to let's say 30 colums and rows then your formula will be
(x - 1) + 30 * (y - 1)
and the maximum number you will then get is 30*30 - 1 = 899

 

[AceHart]

> less than 8191

If that's it already, x + 10 * y will do. No need to get complicated here...

 

[Joker(Div)]

You could use 2D arraies.

 

[Darthfett]

You could use 2D arraies.

The editor doesn't have them, so AceHart suggested a way that simulates them.

 

[Azlier]

>The editor doesn't have them

vJass supports 2D arrays. And, last I checked, Gals uses vJass.

Yes, they're artifical, but still...

 

[Tom Jones]

I would actually do it a little different:
x*8+y

 

[~GaLs~]

>>You could use 2D arraies.
Maybe I would learn it.

>>I would actually do it a little different:
How would that differs from ace's?

 

[Azlier]

2D arrays are simple.

globals
    unit array LolArray [12][12]
    //Actually uses 144 array slots. 12*12.
endglobals

 

[AceHart]

> x*8+y

Well, given the requirements, using 10 instead of 8 has the advantage of the "index" being readable.
If you see 42 for example, you know it comes from 4 and 2,
whereas with x * 8 + y... you need to think about it first