  abcd - state-space matrices
  abinv - AB invariant subspace
  arhnk - Hankel norm approximant
  arl2 - SISO model realization by L2 transfer approximation
  balreal - balanced realization
  bilin - general bilinear transform
  cainv - Dual of abinv
  calfrq - frequency response discretization
  canon - canonical controllable form
  cls2dls - bilinear transform
  colregul - removing poles and zeros at infinity
  cont_frm - transfer to controllable state-space
  cont_mat - controllability matrix
  contr - controllability, controllable subspace, staircase
  contrss - controllable part
  csim - simulation (time response) of linear system
  ctr_gram - controllability gramian
  dbphi - frequency response to phase and magnitude representation
  ddp - disturbance decoupling
  des2tf - descriptor to transfer function conversion
  dscr - discretization of linear system
  dsimul - state space discrete time simulation
  dt_ility - detectability test
  equil - balancing of pair of symmetric matrices
  equil1 - balancing (nonnegative) pair of matrices
  feedback - feedback operation
  flts - time response (discrete time, sampled system)
  frep2tf - transfer function realization from frequency response
  freq - frequency response
  freson - peak frequencies
  g_margin - gain margin
  gfrancis - Francis equations for tracking
  imrep2ss - state-space realization of an impulse response
  invsyslin - system inversion
  kpure - continuous SISO system limit feedback gain
  krac2 - continuous SISO system limit feedback gain
  lin - linearization
  linmeq - Sylvester and Lyapunov equations solver
  lqe - linear quadratic estimator (Kalman Filter)
  lqg - LQG compensator
  lqg2stan - LQG to standard problem
  lqr - LQ compensator (full state)
  ltitr - discrete time response (state space)
  markp2ss - Markov parameters to state-space
  minreal - minimal balanced realization
  minss - minimal realization
  obs_gram - observability gramian
  obscont - observer based controller
  observer - observer design
  obsv_mat - observability matrix
  obsvss - observable part
  p_margin - phase margin
  pfss - partial fraction decomposition
  phasemag - phase and magnitude computation
  ppol - pole placement
  projsl - linear system projection
  repfreq - frequency response
  ricc - Riccati equation
  rowregul - removing poles and zeros at infinity
  rtitr - discrete time response (transfer matrix)
  sm2des - system matrix to descriptor
  sm2ss - system matrix to state-space
  specfact - spectral factor
  ss2des - (polynomial) state-space to descriptor form
  ss2ss - state-space to state-space conversion, feedback, injection
  ss2tf - conversion from state-space to transfer function
  st_ility - stabilizability test
  stabil - stabilization
  svplot - singular-value sigma-plot
  sysfact - system factorization
  syssize - size of state-space system
  tf2ss - transfer to state-space
  time_id - SISO least square identification
  trzeros - transmission zeros and normal rank
  ui_observer - unknown input observer
  unobs - unobservable subspace
  zeropen - zero pencil