Before revision:  Tryptophan is an essential amino acid and is a valuable product in industrial microbiology. We show how Koopman operator theory can thus be used program the steady state of a genetic network in a data-driven context .
After revision:  Tryptophan is an essential amino acid and is a control policy to program the steady state of controlled nonlinear systems with hyperbolic fixed points. This work is motivated by the field of synthetic biology, in which saddle points are common (along with limit cycles), and the aim is to program cells to perform both digital and analog computation, though developing genetic digital computation has been the main focus. We frame the analog computing challenge of generating a steady state input-output function inside living cells. To program the steady state, a data-driven context .