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108 lines
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108 lines
3.1 KiB
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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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<IMG
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WIDTH="117" HEIGHT="39" ALIGN="MIDDLE" BORDER="0"
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ALT="$y = op(M^{-1}) x$">, where <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="$M$"> is a previously built
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preconditioner, stored into <code>p</code>, and <IMG
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WIDTH="22" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
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SRC="img94.png"
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ALT="$op$">
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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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<LI><A NAME="tex2html341"
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HREF="node23.html">Arguments</A>
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<BR><HR>
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<ADDRESS>
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Salvatore Filippone
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2008-07-22
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