>> help control system toolbox
  Control System Toolbox
  Version 6.0 (R14) 05-May-2004
sort of given什么意思
  General.
    ctrlpref    - Set Control System Toolbox preferences.
    ltimodels  - Detailed help on the various types of LTI models.
    ltiprops    - Detailed help on available LTI model properties.
  Creating linear models.
    tf          - Create transfer function models.
    zpk        - Create zero/pole/gain models.
    ss, dss    - Create state-space models.
    frd        - Create a frequency response data models.
    filt        - Specify a digital filter.
    lti/set    - Set/modify properties of LTI models.
   
  Data extraction.
    tfdata      - Extract numerator(s) and denominator(s).
    zpkdata    - Extract zero/pole/gain data.
    ssdata      - Extract state-space matrices.
    dssdata    - Descriptor version of SSDATA.
    frdata      - Extract frequency response data.
    lti/get    - Access values of LTI model properties.
  Conversions.
    tf          - Conversion to transfer function.
    zpk        - Conversion to zero/pole/gain.
    ss          - Conversion to state space.
    frd        - Conversion to frequency data.
    chgunits    - Change units of FRD model frequency points.
    c2d        - Continuous to discrete conversion.
    d2c        - Discrete to continuous conversion.
    d2d        - Resample discrete-time model.
  System interconnections.
    append      - Group LTI systems by appending inputs and outputs.
    parallel    - Generalized parallel connection (see also overloaded +).
    series      - Generalized series connection (see also overloaded *).
    feedback    - Feedback connection of two systems.
    lft        - Generalized feedback interconnection (Redheffer star product).
    connect    - Derive state-space model from block diagram description.
  System gain and dynamics.
    dcgain      - D.C. (low frequency) gain.
    bandwidth  - System bandwidth.
    lti/norm    - Norms of LTI systems.
    pole, eig  - System poles.
    zero        - System (transmission) zeros.
    pzmap      - Pole-zero map.
    iopzmap    - Input/output pole-zero map.
    damp        - Natural frequency and damping of system poles.
    esort      - Sort continuous poles by real part.
    dsort      - Sort discrete poles by magnitude.
    stabsep    - Stable/unstable decomposition.
    modsep      - Region-based modal decomposition.
  Time-domain analysis.
    ltiview    - Response analysis GUI (LTI Viewer).
    step        - Step response.
    impulse    - Impulse response.
    initial    - Response of state-space system with given initial state.
    lsim        - Response to arbitrary inputs.
    gensig      - Generate input signal for LSIM.
    covar      - Covariance of response to white noise.
  Frequency-domain analysis.
    ltiview    - Response analysis GUI (LTI Viewer).
    bode        - Bode diagrams of the frequency response.
    bodemag    - Bode magnitude diagram only.
    sigma      - Singular value frequency plot.
    nyquist    - Nyquist plot.
    nichols    - Nichols plot.
    margin      - Gain and phase margins.
    allmargin  - All crossover frequencies and related gain/phase margins.
    freqresp    - Frequency response over a frequency grid.
    evalfr      - Evaluate frequency response at given frequency.
    frd/interp  - Interpolates frequency response data.
  Classical design.
    sisotool    - SISO design GUI (root locus and loop shaping techniques).
    rlocus      - Evans root locus.
  Pole placement.
    place      - MIMO pole placement.
    acker      - SISO pole placement.
    estim      - Form estimator given estimator gain.
    reg        - Form regulator given state-feedback and estimator gains.
  LQR/LQG design.
    lqr, dlqr  - Linear-quadratic (LQ) state-feedback regulator.
    lqry        - LQ regulator with output weighting.
    lqrd        - Discrete LQ regulator for continuous plant.
    kalman      - Kalman estimator.
    kalmd      - Discrete Kalman estimator for continuous plant.
    lqgreg      - Form LQG regulator given LQ gain and Kalman estimator.
    augstate    - Augment output by appending states.
  State-space models.
    rss, drss  - Random stable state-space models.

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