Algorithms for centrosymmetric and skew-centrosymmetric matrices

We present a simple algorithm that reduces the time complexity of solving the linear system $Gx=b$, where $G$ is a nonsingular centrosymmetric/skew-centrosymmetric matrix. We also reduce the time complexity of solving some complex linear systems. We propose efficient methods for multiplying centrosymmetric/skew-centrosymmetric matrices.