Low-level data import

[claes.o...@gmail.com]

Dear somebody,

We have been using mtex ( currently 4.1) for a couple of years. We use it to calculate Kearn’s and other customized
texture factors factors from the full 0002 pole figure on Zr-base metals.

 We recently upgraded our diffractometer to a Bruker D8 with LynxEye XE detector.
 This means that we can aquire full theta-theta scans at every node point, with improved possibilities to record multiple poles, resolve overlaps etc.
 Now, Matlab is taking care of the data evaluation, and it appears OK. However,
 I am still not sure I understand how to properly construct a pole figure from raw intensities in mtex 4.1.
 
From the curve fitting routine, I build a matrix of intensities ”poleInts” size 1152x9, where every column
(except no 2) represents one set of pole intensities with background subtracted. I have written the following
code to create a pole figure structure in mtex:

----------Code Sample

psi = (0:5:355)*pi/180;
theta = (0:5:75)*pi/180;

% Crystal symmetry, Zr
cs = crystalSymmetry('6/mmm', [1 1 1.62]);

% Specimen symmetry
ss = specimenSymmetry('-1');

% Plotting convention
plotx2north;

hkls = { ...
        Miller(1, 0, -1, 0, cs), ...
        Miller(0, 0, 0, 2, cs), ...
        Miller(1, 0, -1, 1, cs), ...
        Miller(1, 0, -1, 2, cs), ...
        Miller(1, 1, -2, 0, cs), ...
        Miller(1, 0, -1, 3, cs), ...
        Miller(1, 1, -2, 2, cs), ...
        Miller(2, 0, -2, 1, cs); ...
    };

S2G = regularS2Grid('rho', psi, 'theta', theta);

k = 1;

for i = [1 3 4 5 6 7 8 9],
    pf({k}) = PoleFigure(hkls{k}, S2G, poleInts(:, i), 'CS', cs, 'SS', ss);
    k = k + 1;
end;

/-------Code Sample

With this, I manage to create a pole figure object 72x128,  with only the first 8 positions filled out.
The code gives reasonable results, but I feel there should be a better way of doing this?
Is there a cheat-sheet describing pole figure structure and how to perform low-level operations?
The starting point for the code above was one of the generic import routines.

Grateful for any hints.

Best wishes for 2016,

Claes Olsson