A very easy symbolic method for reduction of block diagrams or signal flow graphs with Matlab is presented. The method can be applied to every kind of diagram and it is possible to obtain in one stage all transfer functions for a given input. The method is validated with some examples, including examples from some well-known textbooks in control.
Carlos M. Velez S. (2020). Symbolic reduction of block diagrams and signal flow graphs (https://www.mathworks.com/matlabcentral/fileexchange/33735-symbolic-reduction-of-block-diagrams-and-signal-flow-graphs), MATLAB Central File Exchange. Retrieved .