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