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<!DOCTYPE MAN SYSTEM "../../manrev.dtd">
<MAN>
  <LANGUAGE>eng</LANGUAGE>
  <TITLE>kpure</TITLE>
  <TYPE>Scilab Function</TYPE>
  <DATE>April 1993</DATE>
  <SHORT_DESCRIPTION name="kpure"> continuous SISO system limit feedback gain</SHORT_DESCRIPTION>
  <CALLING_SEQUENCE>
    <CALLING_SEQUENCE_ITEM>g=kpure(sys)  </CALLING_SEQUENCE_ITEM>
  </CALLING_SEQUENCE>
  <PARAM>
    <PARAM_INDENT>
      <PARAM_ITEM>
        <PARAM_NAME>sys</PARAM_NAME>
        <PARAM_DESCRIPTION>
          <SP>: SISO linear system (syslin)</SP>
        </PARAM_DESCRIPTION>
      </PARAM_ITEM>
      <PARAM_ITEM>
        <PARAM_NAME>g</PARAM_NAME>
        <PARAM_DESCRIPTION>
          <SP>: constant</SP>
        </PARAM_DESCRIPTION>
      </PARAM_ITEM>
    </PARAM_INDENT>
  </PARAM>
  <DESCRIPTION>
    <P><VERB>kpure(sys)</VERB> computes the gains <VERB>g</VERB> such that the system
    <VERB>sys</VERB> feedback by g (<VERB>sys/.g</VERB>) has  poles on imaginary axis.</P>
  </DESCRIPTION>
  <EXAMPLE>
<![CDATA[
s=poly(0,'s');
h=syslin('c',(s-1)/(1+5*s+s^2+s^3))
xbasc();evans(h)
g=kpure(h)
hf=h/.g(1)
roots(denom(hf))
 ]]>
  </EXAMPLE>
  <SEE_ALSO>
    <SEE_ALSO_ITEM>
      <LINK>evans</LINK>
    </SEE_ALSO_ITEM>
    <SEE_ALSO_ITEM>
      <LINK>krac2</LINK>
    </SEE_ALSO_ITEM>
  </SEE_ALSO>
</MAN>
