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      <a href="constructor_examples_zero.html#empty">Construct empty ZERO object</a>
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      <a href="constructor_examples_zero.html#xml_file">Construct a ZERO object by loading the object from a file</a>
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      <a href="constructor_examples_zero.html#real">Construct a ZERO object with a real zero</a>
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    <td>
      <a href="constructor_examples_zero.html#complex">Construct a ZERO object with a complex zero</a>
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<p>Poles are specified by in the LTPDA Toolbox by a frequency, f, and (optionally) a quality factor, Q.</p>
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<h2 class="title"><a name="empty"></a>Construct empty ZERO object</h2>
<p>The following example creates an empty zero object</p>
<div class="fragment"><pre class="programlisting">
p = zero()
---- zero 1 ----
None: NaN Hz
----------------
</pre></div>

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<h2 class="title"><a name="xml_file"></a>Construct a ZERO object by loading the object from a file</h2>
<p>The following example creates a new zero object by loading the zero object from disk.</p>
<div class="fragment"><pre class="programlisting">
p = zero(<span class="string">'zero.mat'</span>)
p = zero(<span class="string">'zero.xml'</span>)
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<h2 class="title"><a name="real"></a>Construct a ZERO object with a real zero</h2>
<p>The following code fragment creates a real zero at 1Hz:</p>
<div class="fragment"><pre class="programlisting">
p = zero(1)
---- zero 1 ----
real zero: 1 Hz
----------------
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<p>It is also possible to use a parameter list (PLIST) object</p>
<div class="fragment"><pre class="programlisting">
pl = plist(<span class="string">'f'</span>, 1);

p = zero(pl)
---- zero 1 ----
real zero: 1 Hz
----------------
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<h2 class="title"><a name="complex"></a>Construct a ZERO object with a complex zero</h2>
<p>To create a complex zero, you can specify a quality factor. For example</p>
<div class="fragment"><pre class="programlisting">
p = zero(10,4)
---- zero 1 ----
complex zero: 10 Hz, Q=4 [-0.0019894+0.015791i]
----------------
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<p>It is also possible to use a parameter list (PLIST) object</p>
<div class="fragment"><pre class="programlisting">
pl = plist(<span class="string">'f'</span>, 10, <span class="string">'q'</span>, 4);

zero(pl)
---- zero 1 ----
complex zero: 10 Hz, Q=4 [-0.0019894+0.015791i]
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</pre></div>

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