OrientedLattice: set U matrix using u,v vectors

[Janik Zikovsky]

Using the u,v vectors in the instrument plane as defined in: ​http://horace.isis.rl.ac.uk/Getting_started

(u along the beam, psi = 0 )

define the U matrix in a OrientedLattice that has had its B matrix set previously.

Also, add a method that will return the u,v vectors from the U matrix currently in the OrientedLattice object.

The u and v vectors should not need to be stored in the object.

[Andrei Savici]

Still needs tests and wiki. Refs #3991.

Changeset: 83fece3eb3338732f5e6143a8ad869b3ee072e1e

[Andrei Savici]

Wiki and tests for SetUB. Cleaned up OrientedLattice. Refs #3991

Changeset: 2c1784b26e7988b4b758b968b2bce0408c69776b

[Andrei Savici]

Modified OrientedLattice to return u and v. Refs #3991

Changeset: 0401009ff8d715c84f6641b8aa4a4f969fe5be36

[Andrei Savici]

Some extra python bindings for OrientedLattice. Refs #3991

The setUFromVectors accepts only numpy arrays. It would be better if there were V3Ds instead

Changeset: 191de0352d79ca67d26ad4f2c73e4982dd9d482a

[Andrei Savici]

setUFromVectors now works with lists, V3D or numpy arrays. Refs #3991

Changeset: 98bfe9d98d6241d330243cf4d758a64befc294ed

[Andrei Savici]

How to test SetUB:

1. Load a workspace w
2. Run SetUB. Put some reasonable values
3. At the python console

   w=mtd[ "w " ]
   s=w.getSample()
   o=s.getOrientedLattice()
   print o.getU()
   print o.a()
   

How to test u and v:

At the python console

o=OrientedLattice()
set some UB matrix with o.setUB(...)
print o.getuVector()
print o.getvVector()

Alternatively:

o=OrientedLattice(2,2,2)
o.setUFromVectors([1,1,0],V3D(1,-1,0))
print o.getuVector()
print o.getvVector()

Make sure that multiplying the UB matrix with the u vector results a vector along z Note that setUFromVectors can accept length 3 lists, length 3 numpy arrays, or V3Ds (or any combination of them)

[Stuart Campbell]

This ticket has been transferred to github issue ​4838