Arithmetic Error

rednet.open("right")
local mapperComID = 20
local x = nil
local y = nil
local z = nil
local curx, cury, curz, dir
function getLocation()
returnVal = nil
while true do
  os.clock(10)
  rednet.send(mapperComID,"Need location")
  myEvent = {os.pullEvent()}
  if myEvent[1] == "rednet_message" and myEvent[2] == mapperComID then
   returnVal = myEvent[3]
   break
  end
end
return returnVal
end
function getPos()
   return gps.locate(3)
end
function getDir()
   local dir, x, y, z
   x, y, z = getPos()
   while not turtle.forward() do
  while not turtle.up() do
    turtle.digUp()
  end
   end
   nx, ny, nz = getPos()
   if (x == nx) then
  if (nz > z) then
    dir = 2
  else
    dir = 0
  end
   else
  if (nx > x) then
	 dir = 3
  else
	 dir = 1
  end
   end
   return dir
end

function setDir(toDir)
   while toDir ~= dir do
  turtle.turnLeft()
  if dir == 3 then
	 dir = 0
  else
	 dir = dir+1
  end
   end
end
function moveX()
   distxx = x - curx
   if (x > curx) then
   setDir(3)
   else
   setDir(1)
   end
   distx = math.abs(distx)
   for i = 1, distx do
  while not turtle.forward() do
    while not turtle.up() do
   turtle.digUp()
    end
  end
   end
end
function moveZ()
   distz = z - curz
   if (z < curz) then
   setDir(0)
   else
   setDir(2)
   end
   distz = math.abs(distz)
   for i = 1, distz do
  while not turtle.forward() do
    while not turtle.up() do
   turtle.digUp()
    end
  end
   end
end
function moveY()
   disty = y - cury
   disty = math.abs(disty)
   if (y < cury) then
  for i = 1, disty do
    while not turtle.down() do
   turtle.digDown()
    end
  end
   else
  for i = 1, disty do
    while not turtle.up() do
   turtle.digUp()
    end
  end
   end
end
function goto()
dir = getDir()
bcurx, bcury, bcurz = gps.locate(3)
curx = tonumber(bcurx)
cury = tonumber(bcury)
curz = tonumber(bcurz)

nx = tonumber(x)
ny = tonumber(y)
nz = tonumber(z)
distx = x - curx
disty = y - cury
distz = z - curz
moveX()
curx, cury, curz = getPos()
moveZ()
curx, cury, curz = getPos()
moveY()
curx, cury, curz = getPos()
end
while true do
if (fs.exists("startup_bak") == false) then
  x,y,z = getLocation()
  goto()
end
shell.run("miner")
end

startup: 129 : attempt to perform arithmetic __sub on table and number

x,y,z = getLocation()

startup: 129 : attempt to perform arithmetic __sub on table and number

• The program in which that error occurred: startup.
• The line at which that error occurred: 129.
• What failed: attempt to perform arithmetic __sub on table and number

		distx = x - curx

myTable = {234,345,345,345,2}

myTable = {234,345,345,345,2}
x=1000
distx = x - myTable[4]

distx = x - myTable

x = tonumber(myTable)

returnVal = myEvent[3]
.
.
.
return returnVal

x,y,z = getLocation()

return myEvent[3][1], myEvent[3][2], myEvent[3][3]

Craftplorer, on 25 November 2013 - 11:29 AM said:

Im new to Lua and dont really understand how the variable handel…

nx = tonumber(x)
ny = tonumber(y)
nz = tonumber(z)
distx = x - curx
disty = y - cury
distz = z - curz

Craftplorer, on 26 November 2013 - 04:26 AM said:

I also found the error i forgot to rename x,y,z to nx,ny,nz. So a very stupit error.