Author Topic: Lua Accessing Array (Read 3929 times)

Munchor · « **on:** June 20, 2011, 01:25:59 pm »

a = {1,2}
print(blocks[1])   --Should return "2", but returns "table: 0x1151460"

I really don't know what the problem is here, how to return the index of an array? Thanks

Levak · « **Reply #1 on:** June 20, 2011, 01:47:10 pm »

"blocks" ? Either I'm stupid, or I don't understand why you're trying to access to a nil table ...
In the case you wrote "a" instead of "blocks", it should return "1", not "2" because the Lua is in base 1 (contrary to C/C++/PHP/etc ... in base 0)

Munchor · « **Reply #2 on:** June 20, 2011, 03:28:52 pm »

Quote from: Levak on June 20, 2011, 01:47:10 pm

"blocks" ? Either I'm stupid, or I don't understand why you're trying to access to a nil table ...
In the case you wrote "a" instead of "blocks", it should return "1", not "2" because the Lua is in base 1 (contrary to C/C++/PHP/etc ... in base 0)

Oh my god, I'm so stupid, aren't I? Oh my god, I should really just get some sleep as wow, how did I miss that? Off to sleep, thanks.

Either way, check this out:

Code: [Select]

a = {{1,2},{3,4}}

print(#a)


for i=0,i<(#a),i+1 do
	print(a[i][0])
end

I get as output:

Code: [Select]

2
lua: testing.lua:8: attempt to compare nil with number
stack traceback:
	testing.lua:8: in main chunk
	[C]: ?

i=0, number
#a, number
i+1, number (I don't even have to set this, as it's default, but I get the same error when I don't put it)

What's wrong here, then? Thanks.

Levak · « **Reply #3 on:** June 20, 2011, 03:49:12 pm »

As the error says, you're trying to do a [C] for loop

In lua, it is :

for var = initial_value, end_value, [increment] do

like :

Code: [Select]

a = {{1,2},{3,4}}

print(#a)


for i=0, #a do
	print(a[i][0])
end

but it is cleverest to do :

Code: [Select]

a = {{1,2},{3,4}}

print(#a)


for i, var in ipairs(a) do
	print(i.." : "..var)
end

Author Topic: Lua Accessing Array (Read 3929 times)

Munchor

Lua Accessing Array

Levak

Re: Lua Accessing Array

Munchor

Re: Lua Accessing Array

Levak

Re: Lua Accessing Array