:orphan: mu ** Specifies the genetic predisposition for responding with certain behaviors to certain stimulus elements. The parameter ``mu`` works in conjunction with :doc:`beta` to determine the weights for behaviors in :ref:`the decision function`. The parameter ``mu`` can be set to certain values for certain particular element-behavior pairs. It can also be specified as a single value, in which case the same predisposition is used for all element-behavior pairs. Wildcards (*) may be used to set several values at once. Syntax ------ :: mu = e1->b1: v1, e1->b2: v2, ..., en->bn: vn, default: d mu = v1 mu = *->*:v1 # Same as above mu = e1->*:v1 mu = *->b1:v1 where ``v1,v2,...,vn`` and ``d`` are :ref:`scalar expressions`. Description ----------- ``mu = e1->b1: v1, e1->b2: v2, ..., en->bn: vn, default: d`` sets the genetic predisposition value for - e1->b1 to v1, - e1->b2 to v2, ..., - en->bn to v2, and the value for all other element-behavior pairs to d. - The specification is independent of the list order: ``mu = e1->b1:v1, e1->b2:v2, default:d`` is the same as ``mu = e1->b2:v2, default:d, e1->b1:v1``. - ``default`` need not be specified if all possible combinations ``element->behavior`` are present in the list. For example, :: stimulus_elements = e1, e2 behaviors = b1, b2 mu = e1->b1:v11, e1->b2:v12, e2->b1:v21, e2->b2:v22 ---- ``mu = v1`` sets the genetic predisposition value for all element-behavior pairs to v1. - ``mu = v1`` is the same as ``mu = default: v1``. Dependencies ------------ - The properties ``stimulus_elements`` and ``behaviors`` must be specified before ``mu``. - Each stimulus element used in the specification of ``mu`` must be present in the parameter ``stimulus_elements``. - Each behavior used in the specification of ``mu`` must be present in the parameter ``behaviors``. Examples -------- :: @variables x = 1 mu = element1->behavior1: x, element1->behavior2: x+1, default:x+2 sets the genetic predisposition value for element1->behavior1 to 1 and for element1->behavior1 to 2, and for the remaining possible element-behavior pairs to 3. :: mu = element1->behavior1: 0.5, default:0 sets the genetic prediposition value for element1->behavior1 to 0.5, and for the remaining possible element-behavior pairs to 3. :: mu = 0.1 sets the genetic predisposition value for all element-behavior pairs to 0.1.