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#### 3.5 Example and test programs

The package contains the examples and tests directories; both of them are further divided into fileread and pdegen subdirectories. Their purpose is as follows:

examples
  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 available in MLD2P4.
tests
  contains a set of more sophisticated examples that will allow the user, via the input files in the runs subdirectories, to experiment with the full range of preconditioners implemented in the package.

The fileread directories contain sample programs that read sparse matrices from files, according to the Matrix Market or the Harwell-Boeing storage format; the pdegen programs generate matrices in full parallel mode from the discretization of a sample partial differential equation.

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