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      FDC help: Autopilot utility APMODE
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      The autopilot initialization routine <i>APMODE</i>
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    <p><i>APMODE</i> is used to specify the symmetrical and asymmetrical
    <i>autopilot-modes</i> for autopilot simulation models <i><a href=
    "apilot.htm#APILOT1">APILOT1</a></i>, <i><a href=
    "apilot.htm#APILOT2">APILOT2</a></i>, or <i><a href=
    "apilot.htm#APILOT3">APILOT3</a></i>. The block <i><a href=
    "modectrl.htm">Mode Controller</a></i> within the autopilot simulation
    model uses data from <i>APMODE</i> to define the initial autopilot mode,
    and to find out what switch criteria need to be monitored. The block
    <i><a href="refsgnls.htm">Reference Signals</a></i> uses data from <i>APMODE</i> to specify the
    reference values of <i>theta</i>, <i>phi</i>, <i>H</i>, <i>Hdot</i>, or
    <i>psi</i>. In the current versions of the autopilot simulations, only
    step-inputs at <i>t=0</i> are possible, but it is relatively easy to insert
    other reference signals in this block if required. It is also possible to
    insert a <i>From Workspace</i> block in place of the block <i>Reference
    Signals</i>, e.g. in order to insert reference values which were actually
    measured in a flight-test.</p>
     <p><i>APMODE</i> will create the vectors <i>ymod1S</i>, <i>ymod2S</i>,
    <i>ymod1A</i>, <i>ymod2A</i>, <i>yrefS</i>, and <i>yrefA</i> in the
    workspace. <i>S</i> = symmetrical autopilot mode, <i>A</i> = asymmetrical
    autopilot mode. The vectors <i>ymod</i> contain mode-switches, the vectors
    <i>yref</i> contain reference values. 1 is the initial mode, 2 is used for
    a possible second mode for control laws which have separate &#39;Armed&#39;
    and &#39;Coupled&#39; phases. Examine the blocks <i>Mode Controller</i> and
    <i>Reference Signals</i> and the source-code of <small>APMODE.M</small> in
    the FDC directory <small>APILOT</small> for more details.</p>
     <p><i>APMODE</i> can be started by typing <code>apmode</code> at the Matlab
    command-line, or by double-clicking the <i>APMODE</i> button in the
    autopilot simulation systems. Depending upon the selected autopilot modes
    it may be necessary to enter some values at the Matlab command-line.</p>
     <p><b>Note:</b> <i>APMODE</i> does not initialize the aircraft model,
    actuator and cable models, radio-navigation models, and initial
    flight-condition! Those values must be defined separately, which can be
    done with the utility <i><a href="apinit.htm">APINIT</a></i>.</p>
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