A simple method of evaluating the chain matix of

- cascaded networks is presented. For this purpose, a new graph, called the

-graph, is defined. It is also shown that the

and

parameters of the overall

-matrix may be written by a knowledge of the

-parameter, which is obtained through the

-graph. Applications of the

-graph in matrix multiplication and in obtaining the even and odd parts of a product of polynomials are suggested.