7 replies to this topic

[IceCrasher]

Hi guys, I got the following error message, i can't find out the problem since 2 hours /> :

startup:4: attempt to cancatenate
string and nil


when i tipe in the shell "gps locate" it works

and here is my programm:


rednet.open("right")
x, y, z = gps.locate

print (x..", "..y..", "..z)

How can I save the gps coordinates in x, y and z and show me them by printing on the screen?

Thank you for helping

IceCrasher

[Lyqyd]

You'll need the parentheses:

x, y, z = gps.locate()

[MysticT]

You need to call the gps.locate function, like this:

local x, y, z = gps.locate(1) -- it needs a timeout in seconds, you can change it to whatever you want
if x and y and z then -- check if it could get the position (when it times out the position is nil)
  print(x, ", ", y, ", ", z)
else
  print("Couldn't get position")
end

[IceCrasher]

okay, I did it an now i get the following error message:

gps:69: attempt to compare nil with
number

[MysticT]

You need to add the timeout parameter like I did.

[IceCrasher]

thank you so much xD It's working now *_*

[Lyqyd]

MysticT, on 30 September 2012 - 07:40 PM, said:

You need to add the timeout parameter like I did.

Oh, interesting. I guess I thought it worked like the rednet calls' timeout parameter. I suppose not.

[MysticT]

See this thread for more info.