Unary minus (state space system where the output is multiplied by a gain of -1)
function negate import Modelica; import StateSpace = Modelica_LinearSystems2.Internal.StateSpace2; input StateSpace ss; output StateSpace result(redeclare Real A[size(ss.A, 1), size(ss.A, 2)], redeclare Real B[size(ss.B, 1), size(ss.B, 2)], redeclare Real C[size(ss.C, 1), size(ss.C, 2)], redeclare Real D[size(ss.D, 1), size(ss.D, 2)]) "= -ss"; end negate;