sos2ss Converts Digital Filter Second order section parameters to steady state form. [A,B,C,D] = sos2ss(sos) [A,B,C,D] = sos2ss(sos,g) [A,B,C,D]: Steady state parameters. sos: Second order sectional matrix. g: gain of the system. sos2ss converts a second-order section representation of a digital filter to an equivalent state-space representation. [A,B,C,D] = sos2ss(sos) converts sos, a system expressed in second-order section form, to a single-input, single-output state-space representation: x(n+1)=Ax(n)+Bu(n), y(n)=Cx(n)+Du(n). \begin{eqnarray} f(x,a,r) = \frac{1}{r^{-a}\Gamma(a)} \int_0^x t^{a-1} \exp\left(-rt\right) dt \end{eqnarray} Parthasrathi Panda abs mean max