attempt to preform arithmetic __mul on number and nil?

local function treeChop()
  for i=1, treeNum do
	turtle.select(1)
	turtle.compare()
	  if turtle.compare() then
		turtle.dig()
		turtle.forward()
		while turtle.detectUp() do
		  turtle.digUp()
		  turtle.up()
		end
		while not turtle.detectDown() do
		  turtle.down()
		end
		turtle.back()
		turtle.select(2)
		turtle.place()
		turtle.select(3)
		turtle.place()
	  end
	if treeNum > 1 then
	  turtle.turnRight()
	  for i=1, gapNum+1 do
		turtle.forward()
	  end
	turtle.turnLeft()
	end
  end
end
local function rowSwap()
  if rowNum > 1 then
	turtle.turnLeft()
	turtle.forward()
	turtle.turnRight()
	for i=1, gapNum do
	  turtle.forward()
	end
	turtle.turnLeft()
	for i=1, treeGap-1 do
	  turtle.forward()
	end
	turtle.turnRight()
	turtle.turnRight()
  else
  sleep(1)
  end
end
local function goHome()
  if treeNum > 1 then
	turtle.turnLeft()
	for i=1, treeGap-1 do
	  turtle.forward()
end
	turtle.turnLeft()
  end
  if rowNum > 1 then
	for i=1, rowGap do
	  turtle.forward()
	end
	turtle.turnRight()
	turtle.forward()
	turtle.turnRight()
  end
  for i=firstItem,lastItem do
	turtle.select(i)
	turtle.dropDown()
  end
end
local firstItem,lastItem = 4, 16
term.clear()
print("Lumberjack: Please confirm I have the type of Logs in Slot 1, Saplings in Slot 2, and Bonemeal in Slot 3.")
print("Lumberjack: How many Trees are in a Row?")
local treeNum = tonumber(read())
term.clear()
print("Lumberjack: How many Rows are there?")
local rowNum = tonumber(read())
term.clear()
print("Lumberjack: How big is the gap inbetween trees?")
local gapNum = tonumber(read())
term.clear()
local treeGap = (treeNum - 1) * gapNum + treeNum - 1
local rowGap = (rowNum - 1) * gapNum + rowNum - 1
while true do
  for i=1, rowNum-1 do
	treeChop()
	rowSwap()
  end
  goHome()
  sleep(1)
  print("Lumberjack: Completed, Should I run this task again?\n(Y/N)")
  local evt, Rerun = os.pullEvent("char")
  Rerun = string.lower(Rerun)
  if Rerun == "y" then
	sleep(1)
term.clear()
  elseif Rerun == "n" then
	sleep(1)
term.clear()
	break
  end
end

jewelshisen, on 18 January 2013 - 05:54 AM said:

Did you define treeNum as a Number?

Avous, on 18 January 2013 - 05:55 AM said:

jewelshisen, on 18 January 2013 - 05:54 AM said:

Did you define treeNum as a Number?

Yup! it's 100% user defined it requests it before it attempts to use it.

jewelshisen, on 18 January 2013 - 05:56 AM said:

Avous, on 18 January 2013 - 05:55 AM said:

jewelshisen, on 18 January 2013 - 05:54 AM said:

Did you define treeNum as a Number?

Yup! it's 100% user defined it requests it before it attempts to use it.

Can you show me how you defined it?

Avous, on 18 January 2013 - 06:09 AM said:

I know right? I mean it has to exist but I can't see where I screwed up a number or a variable I believe I'm "for" correctly in all the ones I "CTRL-F" 'd

local function treeChop(num)
  for i=1, num do
        turtle.select(1)
        turtle.compare()
          if turtle.compare() then
                turtle.dig()
                turtle.forward()
                while turtle.detectUp() do
                  turtle.digUp()
                  turtle.up()
                end
                while not turtle.detectDown() do
                  turtle.down()
                end
                turtle.back()
                turtle.select(2)
                turtle.place()
                turtle.select(3)
                turtle.place()
          end
        if num > 1 then
          turtle.turnRight()
          for i=1, gapNum+1 do
                turtle.forward()
          end
        turtle.turnLeft()
        end
  end
end

treeChop(treeNum)

remiX, on 18 January 2013 - 06:15 AM said:

A situation happened to some other guy where he wanted to use a global within a function that was defined
outside the function hoping it would work, but it didn't. The way he fixed it was by changing the arguments
of the function for the number to use within the loop.

So do this:

local function treeChop(num)
  for i=1, num do
		turtle.select(1)
		turtle.compare()
		  if turtle.compare() then
				turtle.dig()
				turtle.forward()
				while turtle.detectUp() do
				  turtle.digUp()
				  turtle.up()
				end
				while not turtle.detectDown() do
				  turtle.down()
				end
				turtle.back()
				turtle.select(2)
				turtle.place()
				turtle.select(3)
				turtle.place()
		  end
		if num > 1 then
		  turtle.turnRight()
		  for i=1, gapNum+1 do
				turtle.forward()
		  end
		turtle.turnLeft()
		end
  end
end

Call it like:

treeChop(treeNum)

local num = tonumber(read())
local function count()
  for i=1, num do
    print(i)
  end
end
count()

local function count()
  for i=1, num do
    print(i)
  end
end

local num = tonumber(read())

count()

remiX, on 18 January 2013 - 06:22 AM said:

Now try this.

local function count()
  for i=1, num do
	print(i)
  end
end

local num = tonumber(read())

count()

Problem is that you define the function before getting the value of treeNum from read()

local num = nil -- Delcare num

local function count()
    for i = 1, num do
        -- do stuff
    end
end

num = tonumber(io.read())

count()