### Syntax

[qTwin, rotQ] = twinq(obj, {Q0})

### Description

[qTwin, rotQ] = twinq(obj, {q0}) calculates the $$Q$$ values in the twin coordinate systems, in rlu. It also returns the rotation matrices, that transforms the $$Q$$ point from the original lattice to the selected twin rlu coordinate system.

### Examples

This example Calculates the $$[1,0,0]$$ and $$[1,1,0]$$ Bragg reflections equivalent positions in the twins.

Q1 = [1 0 0; 1 1 0];
Q2 = cryst.twinq(Q1');


### Input Arguments

Q0
$$Q$$ values in the original crystal in rlu sotred in a matrix with dimensions of $$[3\times n_Q]$$, optional.

### Output Arguments

Qtwin
$$Q$$ values in the twin oordinate system in a cell element for each twin.
rotQ
Rotation matrices with dimensions of $$[3\times 3\times n_{twin}]$$.