PLoS supp. material by Hermann Cuntz
Rotates tree intree by multiplying each point
in space with a simple 3x3 (3D) or 2x2 (2D) rotation-matrix.
Rotation along principal components is also possible
(option '-pc2d' or '-pc3d').
Then first pc is in x, second pc is in y, third pc is in z.
intree should be first centred with
except if rotation around a different point is required.
>> rot_tree (sample2_tree, [x 0 0])
>> rot_tree (sample2_tree, [0 y 0])
>> rot_tree (sample2_tree, [0 0 z])
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