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<!--
 *
 * This help file was generated from filtfilt.sci using help_from_sci().
 *
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  <refnamediv>
    <refname>filtfilt</refname>
    <refpurpose></refpurpose>
  </refnamediv>


<refsynopsisdiv>
   <title>Calling Sequence</title>
   <synopsis>
   [y]=filtfilt(b,a,x)
   </synopsis>
</refsynopsisdiv>

<refsection>
   <title>Parameters</title>
   <variablelist>
   <varlistentry><term>b:</term>
      <listitem><para> Real or complex valued vector or matrix</para></listitem></varlistentry>
   <varlistentry><term>a:</term>
      <listitem><para> Real or complex valued vector or matrix</para></listitem></varlistentry>
   <varlistentry><term>x:</term>
      <listitem><para> Real or complex valued vector or matrix</para></listitem></varlistentry>
   </variablelist>
</refsection>

<refsection>
   <title>Description</title>
   <para>
This is an Octave function
In theory, it forwards and reverse filters the signal and corrects phase distortion upto an extent by a one-pass filter but squares the magnitude response in the process. Practically though, the correction isn't perfect and magnitude response, particularly the stop band is distorted.
</para>
</refsection>

<refsection>
   <title>Examples</title>
   <programlisting role="example"><![CDATA[
1.    y=filtfilt (1,2*%i,[%i -4 0])        // Number of Output argument should be equal to 1
y =   [-0.25i   1   0]
   ]]></programlisting>
</refsection>
</refentry>