Restrictions on parameters during estimation
----------------------------------------------

Sometimes we need to set additional restrictions on parameters during estimation.
For instance, in a regime switching model, one may need a normalization assumption
in order to label the states. All kinds of functions of both estimated and non-estimated
parameters are allowed as long as those functions are known to Matlab or on the Matlab
path.

There is a way of setting these restriction in the model file of a DSGE model. However,
setting these restrictions outside the model file as is done below should be preferred.

In this case, the restrictions are organized in a cell array ::

	restrictions={
		'f1(theta)>=f2(theta)'
		...
		'h1(theta)<=h2(theta)'
		}; 

and passed along to the model object using option **estim_nonlinear_restrictions**.
See the section on estimation for more detail.