Attemp to index nil with number error

Help and Feedback Scripting Support
#1

So, i have print function, and got that error:

function Environment:print()
	local pv = self.P:getXY()
	
	-- wmap generation
	
	local wmap = {}
	for j=1, self.n do
		wmap[j] = {}
		for i=1, self.n do
			wmap[j][i] = "_"
		end
	end
	
	self.wmap = wmap
	
	-- wmap generation
	
	-- setup wmap values
	
	self.wmap[pv.x][pv.y] = "@" -- error here
	
	for i, en in pairs(self.ens) do
		local ev = en:getXY()
		self.wmap[ev.x][ev.y] = "#" -- and sometimes here too
	end
	
	-- print wmap
	
	local wmapString = ""
	
	for j, r in pairs(self.wmap) do
		if wmapString:len() > 0 then wmapString = wmapString .. "\n" end
		for i, c in pairs(r) do
			wmapString = wmapString .. c
		end
	end
	
	Print.Text = wmapString
	
end

Anybody can help me with this please?

#2

Not sure what’s up. Could you like elaborate which one you’re trying to set? I’m assuming pv.y

#3

Im trying to print simulation environment, and by self.wmap[pv.x][pv.y] = “@” i setup agent character and etc.
so i think problem is in agent moving, i trying fix it, damn

#4

I’m a liiiiitle bit confused. So, youre trying to set the value of pv.y which is inside pv.x to “@”. Am I right?

#5

Yeah, im trying to place a character “@” to [pv.x][pv.y] position in wmap array

#6

Have you tried printing [pv.x][pv.y] to check if it nil or not?

#7

Nope, but i know it agent position, so i think it make error cus of agent movement
Anyway im gonna try to print it

#8

But can you try reverse because i think is gonna not print it error.

#9

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now im see the problem

1 Like
#10

Uhhh, which one is it? chsrsrs

#11

okay so, its problem of agent movement, so i need fix it, damn

1 Like
#12

Both, when agent moves on (0, 0) or (0, 1) and etc. it print error cus minimum array index it (1, 1)

1 Like
#13

what does getXY() return in that line

#14

Alright! Glad you found it out!

#15

Assuming it returns a table. chsr

#16

so, it returns position of actor

function Actor.new(self, x, y)
	self.x = x
	self.y = y
	
	self.actions = {
		Vector2.new(1, 0),
		Vector2.new(-1, 0),
		Vector2.new(0, 1),
		Vector2.new(0, -1),
		Vector2.new(1, 1),
		Vector2.new(-1, -1),
		Vector2.new(1, -1),
		Vector2.new(-1, 1),
	}
	
	self.getXY = function ()
		return Vector2.new(self.x, self.y)
	end
end
#17

yea I know but the problem might be in the function because it’s returning nil

#18

Well, is this your getXY function?

#19

oh, so when u call Actor.new and have X and Y as the arguments they won’t update and they’ll stay the way it was when u passed it as a argument

#20

no, its don’t returns nil

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