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<H1><A NAME="SECTION00080000000000000000"></A><A NAME="sec:userinterface"></A>
<BR>
User Interface
</H1>
<P>
The basic user interface of MLD2P4 consists of six routines. The four routines <code>mld_</code> <code>precinit</code>,
<code>mld_precset</code>, <code>mld_precbld</code> and <code>mld_precaply</code> encapsulate all the functionalities
for the setup and the application of any one-level and multi-level
preconditioner implemented in the package.
The routine <code>mld_precfree</code> deallocates the preconditioner data structure, while
<code>mld_precdescr</code> prints a description of the preconditioner setup by the user.
<P>
For each routine, the same user interface is overloaded with
respect to the real/complex case and the single/double precision;
arguments with appropriate data types must be passed to the routine,
i.e.
<UL>
<LI>the sparse matrix data structure, containing the matrix to be
preconditioned, must be of type <code>mld_</code><I>x</I><code>spmat_type</code>
with <I>x</I> = <code>s</code> for real single precision, <I>x</I> = <code>d</code>
for real double precision, <I>x</I> = <code>c</code> for complex single precision,
<I>x</I> = <code>z</code> for complex double precision;
</LI>
<LI>the preconditioner data structure must be of type
<code>mld_</code><I>x</I><code>prec_type</code>, with <I>x</I> =
<code>s</code>, <code>d</code>, <code>c</code>, <code>z</code>, according to the sparse
matrix data structure;
</LI>
<LI>the arrays containing the vectors <IMG
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ALT="$w$"> involved in
the preconditioner application <IMG
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ALT="$w=M^{-1}v$"> must be of type
<I>type</I><code>(</code><I>kind_parameter</I><code>)</code>, with <I>type</I> =
<code>real</code>, <code>complex</code> and <I>kind_parameter</I> = <code>kind(1.e0)</code>,
<code>kind(1.d0)</code>, according to the sparse matrix and preconditioner
data structure; note that the PSBLAS module <code>psb_base_mod</code>
provides the constants <code>psb_spk_</code>
= <code>kind(1.e0)</code> and <code>psb_dpk_</code> = <code>kind(1.d0)</code>;
</LI>
<LI>real parameters defining the preconditioner must be declared
according to the precision of the sparse matrix and preconditioner
data structures (see Section&nbsp;<A HREF="node18.html#sec:precset">6.2</A>).
</LI>
</UL>
A description of each routine is given in the remainder of this section.
<P>
<P>
<BR><HR>
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<UL>
<LI><A NAME="tex2html256"
HREF="node17.html">Subroutine mld_precinit</A>
<LI><A NAME="tex2html257"
HREF="node18.html">Subroutine mld_precset</A>
<LI><A NAME="tex2html258"
HREF="node19.html">Subroutine mld_precbld</A>
<LI><A NAME="tex2html259"
HREF="node20.html">Subroutine mld_precaply</A>
<LI><A NAME="tex2html260"
HREF="node21.html">Subroutine mld_precfree</A>
<LI><A NAME="tex2html261"
HREF="node22.html">Subroutine mld_precdescr</A>
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