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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>Subroutine bld</TITLE>
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<TITLE>Subroutine hierarchy_build</TITLE>
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<H2><A NAME="SECTION00083000000000000000"></A><A NAME="sec:precbld"></A>
<H2><A NAME="SECTION00084000000000000000"></A><A NAME="sec:hier_bld"></A>
<BR>
Subroutine bld
Subroutine hierarchy_build
</H2>
<P>
<DIV ALIGN="CENTER">
<code>call p%bld(a,desc_a,info)</code>
<code>call p%hierarchy_build(a,desc_a,info)</code>
<BR>
</DIV>
<P>
This routine builds the one-level preconditioner <code>p</code> according to the requirements
made by the user through the routines <code>init</code> and <code>set</code>
(see Sections&nbsp;<A HREF="node20.html#sec:hier_bld">6.4</A> and&nbsp;<A HREF="node21.html#sec:smoothers_bld">6.5</A> for multi-level preconditioners).
This routine builds the hierarchy of matrices and restriction/prolongation
operators for the multi-level preconditioner <code>p</code>, according to the requirements
made by the user through the routines <code>init</code> and <code>set</code>.
<P>
<FONT SIZE="+1"><B>Arguments</B></FONT>
@@ -79,9 +79,10 @@ made by the user through the routines <code>init</code> and <code>set</code>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34>&nbsp;</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The sparse matrix structure containing the local part of the
matrix to be preconditioned. Note that <I>x</I> must be chosen according
to the real/complex, single/double precision version of MLD2P4 under use.
to the real/complex,
single/double precision version of MLD2P4 under use.
See the PSBLAS User's Guide for details [<A
HREF="node28.html#PSBLASGUIDE">16</A>].</TD>
HREF="node27.html#PSBLASGUIDE">17</A>].</TD>
</TR>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>desc_a</code></TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>type(psb_desc_type), intent(in)</code>.</TD>
@@ -89,56 +90,20 @@ made by the user through the routines <code>init</code> and <code>set</code>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34>&nbsp;</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The communication descriptor of <code>a</code>. See the PSBLAS User's Guide for
details [<A
HREF="node28.html#PSBLASGUIDE">16</A>].</TD>
HREF="node27.html#PSBLASGUIDE">17</A>].</TD>
</TR>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>info</code></TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>integer, intent(out)</code>.</TD>
</TR>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34>&nbsp;</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>Error code. If no error, 0 is returned. See Section&nbsp;<A HREF="node26.html#sec:errors">8</A> for details.</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>Error code. If no error, 0 is returned. See Section&nbsp;<A HREF="node25.html#sec:errors">8</A> for details.</TD>
</TR>
</TABLE>
<P>
For compatibility with the previous versions of MLD2P4, this routine can be also invoked
as follows:
<P>
<DIV ALIGN="CENTER">
<code>call mld_precbld(p,what,val,info)</code>
</DIV>
<P>
In this case, the routine can be used to build multi-level preconditioners too.
<P>
<P>
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