model_theta

           Define theta function (step from 0 to 1 at x=0)

           CAFE

           fitmodel

           x         - Input x value array. Should be double precision.
           parameter - Parameter to compute model. None.

           None.

           Y = if x < 0 : 0 else 1

           None

           $Id: cafe_model_theta.pro,v 1.1 2003/11/04 14:37:51 goehler Exp $

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