ToString generic method.
toString(object, ...)# S4 method for unknown_statement
toString(object, ...)
# S4 method for comment
toString(object, ...)
# S4 method for line_break
toString(object, ...)
# S4 method for equation
toString(object, ...)
# S4 method for ode
toString(object, ...)
# S4 method for if_statement
toString(object, ...)
# S4 method for compartment
toString(object, ...)
# S4 method for compartment_property
toString(object, ...)
# S4 method for compartment_initial_condition
toString(object, ...)
# S4 method for mrgsolve_model
toString(object, ...)
character value/vector
generic object
extra arguments needed for toString conversion