Syntax for multi-dimensional arrays?
- Thread starter Ulqiorra
- Start date
Glitchfinder
Staff
That is because Ruby does not include multidimensional arrays. Instead, we have the table class. And, as far as I remember, that would be how you get data out of it. Check out "Table" in the RMXP or RMVX help file.
Also, it looks like the array you're trying to pull data from has not been initialized. Just a thought.
Also, it looks like the array you're trying to pull data from has not been initialized. Just a thought.
Glitchfinder
Staff
Near":11u6di4i said:
The reason I mentioned that is because it is currently treating the variable as an instance of nil, instead of as an array.
If I recall correctly, Tables can only store signed integers. If you want to store other objects, you can make your own multi-dimensional array this way:
As you can see, you can get some pretty weird logical errors going on if you use this. It also is not very efficient. I'd say use 100 by 100 tops if you want to use this one in a game.
Code:
def init_multi_array(width) #Multi-Dimensional Array Creation
arr = []
for i in 0...width
arr[i] = []
end
return arr #Return multi-array
end
multi_arr = init_multi_array(10) #create a multi array with a width of 10
multi_arr[3][4] = "foo" #this will work to set
multi_arr[3][4] #=>"foo"
multi_arr[12] = "bar" #Note that this will work, because the first dimension of this multi array is just an array
multi_arr[12][3] #This will return an out of bounds exception (Since you just set multi_arr[12] to "bar" and there is no 4th character)
multi_arr[17][2] #This will get you an undefined method [] for nil because the 17th slot in your first dimension is nil
As you can see, you can get some pretty weird logical errors going on if you use this. It also is not very efficient. I'd say use 100 by 100 tops if you want to use this one in a game.
I have this solved, actually. I have a MultiArray class.
But one more question.
I am using this for the same thing I am using the MultiArray for:
and I get a NoMethodError (same one from the multiarray ("[]" is not a method of NilClass)).
But one more question.
I am using this for the same thing I am using the MultiArray for:
Code:
def get_dis(x, y)
dx = (@x - x) * -1
dy = (@y - y) * -1
return dx, dy
end
def update
dis = get_dis(0, 0)
p dis[0]
end
and I get a NoMethodError (same one from the multiarray ("[]" is not a method of NilClass)).
Brewmeister
Sponsor
what line is the new error on?
It looks like you're returning 2 values. Try
return [dx, dy]
It looks like you're returning 2 values. Try
return [dx, dy]
Oh, I just remembered something. I actually already made a Multi-Dimensional Array class. Let me find it for you.
Here we go, just found it: viewtopic.php?f=11&t=44010&start=0
Use this one, because if you get an error, it will tell you exactly why it got an error.
Here we go, just found it: viewtopic.php?f=11&t=44010&start=0
Use this one, because if you get an error, it will tell you exactly why it got an error.
Ok. You just said you were still getting an error SephirothSpawn
Sponsor
Hash could work very well as a work-around for this:
But like Atoa said, since arrays can hold any object, including arrays, you can do it like that. I however I have learned that hashes with a key is probably an easier way. Just use an array key, with each dimension within the array.
Code:
object = {}
key = [x, y, z]
object[key] = 'something'
#vs.
object = []
object[x] = []
object[x][y] = []
object[x][y][z] = 'something'But like Atoa said, since arrays can hold any object, including arrays, you can do it like that. I however I have learned that hashes with a key is probably an easier way. Just use an array key, with each dimension within the array.