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<!DOCTYPE MAN SYSTEM "../../manrev.dtd">
<MAN>
  <LANGUAGE>fr</LANGUAGE>
  <TITLE>sqroot  </TITLE>
  <TYPE>Scilab Function  </TYPE>
  <DATE>April 1993  </DATE>
  <SHORT_DESCRIPTION name="sqroot"> factorisation hermitienne W*W&apos;  </SHORT_DESCRIPTION>
  <CALLING_SEQUENCE>
  <CALLING_SEQUENCE_ITEM>sqroot(X)  </CALLING_SEQUENCE_ITEM>
  </CALLING_SEQUENCE>
  <PARAM>
 <PARAM_INDENT>
  <PARAM_ITEM>
  <PARAM_NAME>X  </PARAM_NAME>
  <PARAM_DESCRIPTION>
  <SP>
    : matrice complexe ou réelle, symétrique définie non-négative
</SP>
  </PARAM_DESCRIPTION> 
  </PARAM_ITEM>
 </PARAM_INDENT>
  </PARAM>
  <DESCRIPTION>
  <P>
    renvoie W telle que <VERB>X=W*W&apos;</VERB> (en utilisant svd).
  </P>
  </DESCRIPTION>
  <EXAMPLE><![CDATA[
X=rand(5,2)*rand(2,5);X=X*X';
W=sqroot(X)
norm(W*W'-X,1)
//
X=rand(5,2)+%i*rand(5,2);X=X*X';
W=sqroot(X)
norm(W*W'-X,1)
 ]]></EXAMPLE>
  <SEE_ALSO>
    <SEE_ALSO_ITEM> <LINK>chol</LINK> </SEE_ALSO_ITEM>     <SEE_ALSO_ITEM> <LINK>svd</LINK> </SEE_ALSO_ITEM>
  </SEE_ALSO>
</MAN>
