<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<!DOCTYPE MAN SYSTEM "../../manrev.dtd">
<MAN>
  <LANGUAGE>eng</LANGUAGE>
  <TITLE>nehari</TITLE>
  <TYPE>Scilab Function</TYPE>
  <DATE>April 1993</DATE>
  <SHORT_DESCRIPTION name="nehari"> Nehari approximant</SHORT_DESCRIPTION>
  <CALLING_SEQUENCE>
    <CALLING_SEQUENCE_ITEM>[x]=nehari(R [,tol])  </CALLING_SEQUENCE_ITEM>
  </CALLING_SEQUENCE>
  <PARAM>
    <PARAM_INDENT>
      <PARAM_ITEM>
        <PARAM_NAME>R</PARAM_NAME>
        <PARAM_DESCRIPTION>
          <SP>: linear system (<VERB>syslin</VERB> list)</SP>
        </PARAM_DESCRIPTION>
      </PARAM_ITEM>
      <PARAM_ITEM>
        <PARAM_NAME>x</PARAM_NAME>
        <PARAM_DESCRIPTION>
          <SP>: linear system (<VERB>syslin</VERB> list)</SP>
        </PARAM_DESCRIPTION>
      </PARAM_ITEM>
      <PARAM_ITEM>
        <PARAM_NAME>tol</PARAM_NAME>
        <PARAM_DESCRIPTION>
          <SP>: optional threshold</SP>
        </PARAM_DESCRIPTION>
      </PARAM_ITEM>
    </PARAM_INDENT>
  </PARAM>
  <DESCRIPTION>
    <P><VERB>[x]=nehari(R [,tol])returns</VERB> the Nehari approximant of <VERB>R</VERB>.</P>
    <P><VERB>R</VERB> = linear system in state-space representation (<VERB>syslin</VERB> list).</P>
    <P><VERB>R</VERB> is strictly proper and <VERB>- R~</VERB> is stable 
    (i.e. <VERB>R</VERB> is anti stable).</P>
    <VERBATIM>
<![CDATA[
    || R - X ||oo = min || R - Y ||oo
                  Y in Hoo
   ]]>
    </VERBATIM>
  </DESCRIPTION>
</MAN>
