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<H2><A NAME="SECTION00084000000000000000"></A><A NAME="sec:hier_bld"></A>
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<BR>
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Subroutine hierarchy_build
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</H2>
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<P>
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<DIV ALIGN="CENTER">
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<code>call p%hierarchy_build(a,desc_a,info)</code>
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<BR>
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</DIV>
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<P>
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This routine builds the hierarchy of matrices and restriction/prolongation
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operators for the multi-level preconditioner <code>p</code>, according to the requirements
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made by the user through the routines <code>init</code> and <code>set</code>.
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<P>
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<FONT SIZE="+1"><B>Arguments</B></FONT>
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<P></P>
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<P>
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<TABLE CELLPADDING=3>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>a</code></TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>type(psb_</code><I>x</I><code>spmat_type), intent(in)</code>.</TD>
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</TR>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34> </TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The sparse matrix structure containing the local part of the
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matrix to be preconditioned. Note that <I>x</I> must be chosen according
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to the real/complex,
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single/double precision version of MLD2P4 under use.
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See the PSBLAS User's Guide for details [<A
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HREF="node26.html#PSBLASGUIDE">13</A>].</TD>
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</TR>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>desc_a</code></TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>type(psb_desc_type), intent(in)</code>.</TD>
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</TR>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34> </TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The communication descriptor of <code>a</code>. See the PSBLAS User's Guide for
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details [<A
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HREF="node26.html#PSBLASGUIDE">13</A>].</TD>
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</TR>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>info</code></TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>integer, intent(out)</code>.</TD>
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</TR>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34> </TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>Error code. If no error, 0 is returned. See Section <A HREF="node24.html#sec:errors">7</A> for details.</TD>
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</TR>
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</TABLE>
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