# Accessor Functions for `simObj' Objects Get or set simulation model parameters, main or sub-equations, initial values, time steps or solvers and extract simulation results. methods ```r parms(obj, ...) parms(obj) <- value main(obj, ...) main(obj) <- value equations(obj, ...) equations(obj) <- value init(obj, ...) init(obj) <- value inputs(obj, ...) inputs(obj) <- value times(obj, ...) times(obj) <- value solver(obj, ...) solver(obj) <- value #observer(obj, ...) #observer(obj) <- value initfunc(obj, ...) initfunc(obj) <- value out(obj, ...) out(obj) <- value ``` ## Arguments - `obj`: A valid `simObj` instance. - `value`: Named list, vector, function or other data structure (depending on the slot and model class) with the same structure as the value returned by `parms`. Either all or a subset of values (e.g. single elements of vectors or lists) can be changed at once. - `...`: Reserved for method consistency. ## Details These are the accessing functions for `parms`, `times` etc. Please take care of the semantics of your model when changing slots. All, element names, data structure and values have to correspond to you model object definition. For example in `init` the applied names must exactly correspond to the names and number (!) of state variables. The restrictions of `parms` or `equations` are less strict (additional values for ``future use'' are allowed). The function `times` allows either to assign or to modify a special vector with three elements named `from`, `to` and `by` or to overwrite `times` with an un-named sequence (e.g. `seq(1, 100, 0.1)`. To ensure object consistency function `out` cannot assign arbitrary values. It can only extract or delete the contents (by assigning `NULL`) of the `out`-slot. ## Returns A list, named vector, matrix or function (for `main` slot) or list of functions (`equation` slot) or other appropriate data structure depending on the class of the model object. ## See Also General explanation of the slots can be found in `simecol-package`. Usage of the `observer` slot is found in the special help file `observer`. ## Examples ```r data(lv) parms(lv) parms(lv) <- c(k1 = 0.2, k2 = 0.5, k3 = 0.3) parms(lv)["k2"] <- 0.5 data(conway) parms(conway) parms(conway)$srv <- c(2, 2) parms(conway) ## add a new named parameter value parms(lv)["dummy"] <- 1 ## remove dummy parameter parms(lv) <- parms(lv)[names(parms(lv)) != "dummy"] ## simulation and extraction of outputs lv <- sim(lv) o <- out(lv) ## remove outputs from object out(lv) <- NULL ## store object persistently to the disk ## Not run: save(lv, file = "lv.Rdata") # in binary form dput(as.list(lv), file = "lv-list.R") # in text form ## End(Not run) ```

parms function