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<H2><A NAME="SECTION00055000000000000000"></A><A NAME="sec:ex_and_test"></A>
<BR>
Example and test programs
</H2>
The package contains the <code>examples</code> and <code>tests</code> directories;
both of them are further divided into <code>fileread</code> and
<code>pdegen</code> subdirectories. Their purpose is as follows:
<DL>
<DT><STRONG><TT>examples</TT></STRONG></DT>
<DD>contains a set of simple example programs with a
  predefined choice of preconditioners, selectable via integer
  values. These are intended to get an acquaintance with the
  multilevel preconditioners.
</DD>
<DT><STRONG><TT>tests</TT></STRONG></DT>
<DD>contains a set of more sophisticated examples that
  will allow the user, via the input files in the <code>runs</code>
  subdirectories, to experiment with the full range of preconditioners
  implemented in the library.
</DD>
</DL>
The <code>fileread</code> directories contain sample programs that read
sparse matrices from files, according to the Matrix Market or the
Harwell-Boeing storage format; the <code>pdegen</code> instead generate
matrices in full parallel mode from the discretization of a sample PDE. 
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