**Subsections**

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n_state_model.ref_domain

Set the reference domain for the ``2-domain`' N-state model.

n_state_model.ref_domain(ref=None)

ref: The domain which will act as the frame of reference. This is only valid for the ``2-domain`' N-state model.

Prior to optimisation of the ``2-domain`' N-state model, which of the two domains will act as the frame of reference must be specified. The N-states will be rotations of the other domain, so to switch the frame of reference to the other domain simply transpose the rotation matrices.

To set up a 5-state model with ``C`' domain being the frame of reference, type:

[numbers=none]
relax> n_state_model.ref_domain(ref='C')

The relax user manual (PDF), created 2016-10-28.