Create model structure objects (see struc-class), which are
symbolic scalars, vectors, and matrices with elements that are expressions
involving parameters, state variables.
struc(...)
scal(...)
vec(...)
mat(...)
as.struc(x)character vectors or matrices
object to convert to a struc object
struc object -- see struc-class
scal, vec, and mat are similar to struc, but
ensure that the resulting struc objects are scalars, vectors, or
matrices respectfully.
struc objects can be created in other ways and symbolically
manipulated using the functions listed below in the 'see also' section.
Other struc_functions:
cross_mat(),
struc_block(),
struc_stretch()