Something wrong of Miller calculation for HCP structure

[Ryan Stone]

Hi:

For MTEX 5.1.1., I have a HCP structure with lattice parameters a=2.664, c=4.9469.

Then if I run the code: vector3d(Miller(0,0,0,1, CS1, 'uvw'))

ans = vector3d (show methods, plot)

 size: 1 x 1

  x       y       z

  0       0 1.64897

This is wrong.

Then, if I run the code: vector3d(Miller(0,0,1, CS1, 'uvw'))

ans = vector3d (show methods, plot)

 size: 1 x 1

  x      y      z

  0      0 4.9469

This is right.

No such a problem for plane normals, but only for directions.

Is this a bug?

[Ralf Hielscher]

Dear Ryan,

your first notation uses four digit Miller indices UVTW which relates to the 3 digit Miller indices by the formulae

U = 2*u - v, V = 2*v - u, T = - (u+v), W = 3*w

Hence [0001] is 1/3 of the length of [001]

Ralf.

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