# Homework Help: Vectors Indexes? x y z?

1. Aug 29, 2010

### itsvt2013

1. The problem statement, all variables and given/known data

for direction 1 and 2, find the indexes x y z for both

2. Relevant equations

n/a

3. The attempt at a solution

direction 1 is 0,0.25,0.3 ?
direction 2 is 0,-0.3,0.25 ?

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2. Aug 29, 2010

What is the definition of an index?

3. Aug 29, 2010

### itsvt2013

the direction [x,y,z]

4. Aug 29, 2010

Okay, I see the pic now. You are starting from the origin. Just calculate where the point is in the table.

5. Aug 29, 2010

### itsvt2013

I'm not quite really sure if I get this right since it is in 3D and is very confusing.

Now, I have Direction 1 [0, 0.25, 0.3]

Direction 2 [0.4, 0.25, -0.3]

Would you please verify if what I have looks good?

6. Aug 29, 2010

Yeah, now it looks good. If you need to justify the distances, ue pythagoras theorem.

7. Aug 29, 2010

### itsvt2013

Alright, thank you very much for your clarifications.

8. Aug 30, 2010

### HallsofIvy

The standard English term is "x, y, z components" not "indices". In "British English", the letters "x", "y", "z" in, say, $u_x$, $u_y$, or $u_z$ would be "indices" (in "American English", "subscripts").

9. Sep 25, 2010

### wasims

hi,can anybody tell how to find intercept with axis for miller indices?