If A is a square matrix with integer entries, the command xminusa(A) will create the matrix that represents, in long format, the matrix of polynomials xI - A. Normally the command will be given in the form G = xminusa(A); ldisp(G). The semicolon suppresses display of the actual matrix G and ldisp(G) displays the matrix of polynomials it represents.
Return to Chapter 8.