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<h4 class="subsection">D.8.1 <code>harminv</code> input parameters</h4>

<p>The virtual machine interface to the <code>harminv</code> library provides
only a single function, callable as

<pre class="example">     library('harminv','hsolve')
</pre>
   <p class="noindent">The input to this function is an operand of the form

<pre class="example">     (signal,(fmin,fmax),nf)
</pre>
   <p class="noindent">where

     <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">complex</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><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">math</a>). 
<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>). 
</ul>

<p class="noindent">If a value of 0 is specified for <code>nf</code> a default value of

<pre class="example">     min(300, (fmax - fmin) * n * 1.1)
</pre>
   <p class="noindent">is used, where <code>n</code> is the length of <code>signal</code>. The
computation time increases cubically with <code>nf</code>.

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