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<a name="harminv-input-parameters"></a>
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<a name="harminv-input-parameters-1"></a>
<h3 class="subsection">D.8.1 <code>harminv</code> input parameters</h3>

<p>The virtual machine interface to the <code>harminv</code> library provides
only a single function, callable as
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">library('harminv','hsolve')
</pre></td></tr></table>

<p>The input to this function is an operand of the form
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">(signal,(fmin,fmax),nf)
</pre></td></tr></table>

<p>where
</p>
<ul>
<li>
<code>signal</code> is a list of complex numbers containing samples
of the function to be decomposed at equal time steps
(<a href="complex.html#complex"><code>complex</code></a> and <a href="Representation-of-Numeric-and-Textual-Data.html#Representation-of-Numeric-and-Textual-Data">Representation of Numeric and Textual Data</a>).
</li><li>
<code>fmin</code> and <code>fmax</code> are the band limits expressed in units
of inverse time steps as floating point numbers (<a href="math.html#math"><code>math</code></a>).
</li><li>
<code>nf</code> is the number of spectral basis functions expressed as a
natural (<a href="Representation-of-Numeric-and-Textual-Data.html#Representation-of-Numeric-and-Textual-Data">Representation of Numeric and Textual Data</a>).
</li></ul>

<p>If a value of 0 is specified for <code>nf</code> a default value of
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">min(300, (fmax - fmin) * n * 1.1)
</pre></td></tr></table>

<p>is used, where <code>n</code> is the length of <code>signal</code>. The
computation time increases cubically with <code>nf</code>.
</p>

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