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2D arrays in Lua?

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2D arrays in Lua?

4 replies

2D arrays in Lua?

DannyDeth
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25.02.11 03:01:58 pm

Hi all,

I am busy doing a small Lua project which involves an array containing the entire map on an array, and because I cannot use a 1D array to do this, I need to know how I could create a 2D array if it is possible to do so.

EDIT: I think it might be something like this but I am not sure:

array2d = {}{}

Thanks,
DannyDeth.

Re: 2D arrays in Lua?

Roni
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25.02.11 03:18:52 pm

array2d=
{
{}
}

or jsut array2d={{}}

Re: 2D arrays in Lua?

Banaan
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25.02.11 03:19:43 pm

You need tilex by tiley right?

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array2d = {
	x = {},
	y = {}
}

for tile 3|2 you simply use

x, y = array2d.x[3], array2d.y[2]

Or isn't that what you're looking for?

Re: 2D arrays in Lua?

Flacko
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25.02.11 03:20:04 pm

Well, since a 2D array is an array (or a group of them) inside another array:

array2d = {{}}

BTW, here's a function similar to lee's initArray that will create an array of an arbitrary number of dimensions:

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function table.copy(t)
	local b = {}
	for k,v in pairs(t) do
		if type(v)=='table' then
			v = table.copy(v)
		end
		b[k] = v
	end
	return b
end

function table.array(v, ...)
	local t = {}
	if arg[2] then
		v = table.array(v,table.unpack(arg,2))
	end
	for i=1,arg[1] do
		if arg[2] then v = table.copy(v) end
		t[i]=v
	end
	return t
end

usage:

a = table.array(5,32,32) --32x32 array filled with 5s

Edit: Whoops, didn't read you were storing a map. If that's the case, it's still possible to store a whole map in a 1D array, you just need to know what's the width of the map:

oned[y*width+x] = twod[x][y]

(Assuming you're storing the map "line-by-line")

edited 1×, last 04.08.11 09:54:06 pm

Re: 2D arrays in Lua?

DannyDeth
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25.02.11 03:30:14 pm

Ok, thanks you guys

I tried searching for info but it was all about sparsing which just isn't my scene, I've used it before and it isn't nice ( considering it can take like 200mb of RAM, it sux ).

@Banaan: No it isn't exatly what I wanted but... yeah. It it kinda usable. To a degree.

Flacko's was slightly more usable, thanks to all anyway.

~Danny