This function is designed to establish an initial object which maps the fitness values of genome positions based on the state of that site. At present, this has no meaning if the model of simulation is no NK, Additive, or Fixed. Where the first is Kauffman's NK model and form of calculations, Additive is what that word would make you think for fitness effects of mutations at sites, and Fixed is when user supplied a defined fitness matrix that describes the entire fitness landscape. NOTE: This function should likely be called without supplying any non-default arguments as it will use the shape_ options defined.
Useful links