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<A NAME="MatFactorInfo"><H1>MatFactorInfo</H1></A>
Data passed into the matrix factorization routines
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
typedef struct {
PetscReal shiftnz; /* scaling of identity added to matrix to prevent zero pivots */
PetscReal shiftpd; /* if true, shift until positive pivots */
PetscReal shift_fraction; /* record shift fraction taken */
PetscReal diagonal_fill; /* force diagonal to fill in if initially not filled */
PetscReal dt; /* drop tolerance */
PetscReal dtcol; /* tolerance for pivoting */
PetscReal dtcount; /* maximum nonzeros to be allowed per row */
PetscReal fill; /* expected fill; nonzeros in factored matrix/nonzeros in original matrix*/
PetscReal levels; /* ICC/ILU(levels) */
PetscReal pivotinblocks; /* for BAIJ and SBAIJ matrices pivot in factorization on blocks, default 1.0
factorization may be faster if do not pivot */
PetscReal zeropivot; /* pivot is called zero if less than this */
} MatFactorInfo;
</PRE>
In Fortran these are simply double precision arrays of <A HREF="../Sys/size.html#size">size</A> MAT_FACTORINFO_SIZE
<P>
Notes: These are not usually directly used by users, instead use <A HREF="../PC/PC.html#PC">PC</A> type of LU, ILU, CHOLESKY or ICC.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatLUFactorSymbolic.html#MatLUFactorSymbolic">MatLUFactorSymbolic</A>(), <A HREF="../Mat/MatILUFactorSymbolic.html#MatILUFactorSymbolic">MatILUFactorSymbolic</A>(), <A HREF="../Mat/MatCholeskyFactorSymbolic.html#MatCholeskyFactorSymbolic">MatCholeskyFactorSymbolic</A>(), <A HREF="../Mat/MatICCFactorSymbolic.html#MatICCFactorSymbolic">MatICCFactorSymbolic</A>(), <A HREF="../Mat/MatICCFactor.html#MatICCFactor">MatICCFactor</A>(),
<BR><A HREF="../Mat/MatFactorInfoInitialize.html#MatFactorInfoInitialize">MatFactorInfoInitialize</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/../../include/petscmat.h.html#MatFactorInfo">src/mat/../../include/petscmat.h</A>
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