[Lua]Vectors?

Hey there,
I've just found out about the GPS feature which is very cool, but I can only find mathematical/complex commands for vectors (such as multiplying). I'm looking to seperate only the Y value, but I can't figure out how to do that (y = VectorA.y? y = VectorA[y]? ). Help?

(p.s. If im at the subject, can you add a page with all Computercrafts basic commads (Loops, If, arrays etc.) for us programmers who dont know Lua so we can learn faster?)

There is plenty of information to get you started in the tutorial section, and in links in the stickies.

If you'd have tried this, then you would find that

local y = vec.y

will give you the y value.

My test program is:

rednet.open("right")
vec = vector.new(0, 0, 0)
vec = gps.locate(5, true)
y = vec.y
print("H")
print(y)

But it returns:

Finding position...
10.440307 meters from 821,5,881
12 meters from 831,5,872
9.219544 meters from 837,5,891
Position is 831,5,884
vector:7: attempt to index ? (a number value)

YoavD, on 25 March 2012 - 01:05 PM said:

My test program is:

rednet.open("right")
vec = vector.new(0, 0, 0)
vec = gps.locate(5, true)
y = vec.y
print("H")
print(y)

But it returns:

Finding position...
10.440307 meters from 821,5,881
12 meters from 831,5,872
9.219544 meters from 837,5,891
Position is 831,5,884
vector:7: attempt to index ? (a number value)

You are overwriting vec when you do vec = gps.locate(5, true), with a number.

Doesn't gps.locate return a vector?

YoavD, on 25 March 2012 - 01:10 PM said:

Doesn't gps.locate return a vector?

No, it returns 3 number values.

You have to use:

local x, y, z = gps.locate(5, true)

The way you used it just grabbed the first returned value of locate(), the x coordinate.
And since x is just a number, so will your vec be. That's why there isn't any vec.y

Ok, now it works thank you very much