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Matrix Graph Fillin
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::

	Matrix graph fillin = <integer>4.7.10_matrix_factorization_overlap.txt

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Description / Usage
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This optional card sets the graph level of fill-in for approximate factorizations used in
preconditioner construction for ILU(k), ICC(k) and BILU(k). The input parameter is
defined as

<integer>
    k, specifies the graph level of fill-in, k > 0.

If the *Matrix graph fillin* card is omitted, the default value of **k** is **0.**

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Examples
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Following is a sample card:
::

	Matrix graph fillin = 2

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Technical Discussion
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As the level of graph fill-in increases, the accuracy (usefulness) of the preconditioner
increases; however, so does memory usage as well as the time required to compute the
preconditioner.