Returns a vector response from a population
getResponse(pop, trait, use, simParam = NULL, ...)
an object of class Pop or HybirdPop
a vector or custom function
a character ("rand", "gv", "ebv", "pheno", or "bv"; note that "bv" doesn't work on class HybridPop)
simulation parameters are only used when use="bv"
are additional arguments passed to trait when trait is a function