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<h4 class="subsection">30.1.1 Variables common to all <acronym>OCST</acronym> system formats</h4>
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<p>The data structure elements (and variable types) common to all system
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representations are listed below; examples of the initialization
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and use of the system data structures are given in subsequent sections and
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in the online demo <code>DEMOcontrol</code>.
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<dt><var>n</var><dt><var>nz</var><dd>The respective number of continuous and discrete states
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in the system (scalar)
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<br><dt><var>inname</var><dt><var>outname</var><dd>list of name(s) of the system input, output signal(s). (list of strings)
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<br><dt><var>sys</var><dd>System status vector. (vector)
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<p>This vector indicates both what representation was used to initialize
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the system data structure (called the primary system type) and which
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other representations are currently up-to-date with the primary system
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type (see <a href="structaccess.html#structaccess">structaccess</a>).
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<p>The value of the first element of the vector indicates the primary
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<dt>0<dd>for tf form (initialized with <code>tf2sys</code> or <code>fir2sys</code>)
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<br><dt>1<dd>for zp form (initialized with <code>zp2sys</code>)
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<br><dt>2<dd>for ss form (initialized with <code>ss2sys</code>)
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<p>The next three elements are boolean flags that indicate whether tf, zp,
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or ss, respectively, are “up to date" (whether it is safe to use the
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variables associated with these representations). These flags are
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changed when calls are made to the <code>sysupdate</code> command.
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<br><dt><var>tsam</var><dd> Discrete time sampling period (nonnegative scalar).
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<var>tsam</var> is set to 0 for continuous time systems.
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<br><dt><var>yd</var><dd> Discrete-time output list (vector)
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<p>indicates which outputs are discrete time (i.e.,
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produced by D/A converters) and which are continuous time.
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yd(ii) = 0 if output ii is continuous, = 1 if discrete.
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<p>The remaining variables of the system data structure are only present
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if the corresponding entry of the <code>sys</code> vector is true (=1).
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