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