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109 lines
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109 lines
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<TITLE>Subroutine mld_precaply</TITLE>
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<H2><A NAME="SECTION00084000000000000000"></A><A NAME="sec:precaply"></A>
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<BR>
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Subroutine mld_precaply
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</H2>
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<P>
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<DIV ALIGN="CENTER">
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<code>mld_precaply(p,x,y,desc_a,info)</code>
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<BR><code>mld_precaply(p,x,y,desc_a,info,trans,work)</code>
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<BR>
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</DIV>
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<P>
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This routine computes <!-- MATH
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$y = op(M^{-1})\, x$
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-->
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<SPAN CLASS="MATH"><IMG
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WIDTH="118" HEIGHT="39" ALIGN="MIDDLE" BORDER="0"
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SRC="img94.png"
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ALT="$y = op(M^{-1}) x$"></SPAN>, where <SPAN CLASS="MATH"><IMG
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WIDTH="23" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
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SRC="img59.png"
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ALT="$M$"></SPAN> is a previously built
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preconditioner, stored into <code>p</code>, and <SPAN CLASS="MATH"><IMG
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WIDTH="21" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
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SRC="img95.png"
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ALT="$op$"></SPAN>
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denotes the preconditioner itself or its transpose, according to
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the value of <code>trans</code>.
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Note that, when MLD2P4 is used with a Krylov solver from PSBLAS,
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<code>mld_precaply</code> is called within the PSBLAS routine <code>mld_krylov</code>
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and hence it is completely transparent to the user.
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<ADDRESS>
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Salvatore Filippone
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2008-07-23
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