1. A non-transitory computer-readable medium containing instructions executable by at least one processor, the instructions when executed cause the at least one processor to: provide an interface to permit a user to build or edit a graphical model that includes at least one block and a plurality of connections, each of the plurality of connections representing a signal received by or output from the at least one block; receive information regarding one of the signals, in the graphical model, that has a size or dimensionality that changes during execution of the graphical model; visually present the graphical model, where a single one of the plurality of connections corresponding to the one signal implicitly conveys the size or the dimensionality of the one signal that changes during execution of the graphical model; and generate code from the graphical model.