Data Type
IntegerDefault Value
1 for sparse matrices2 for full matrices.
Description
This parameter controls how the matrix [A] is stored and processed. The following options are available:
MFMAT=1: Profile Solver Accounts for the sparsity of matrix [A] on an equation by equation basis. Typical applications include finite element and finite difference programs. This is the default for sparse matrices. 

MFMAT=2: Block Solver Divides the matrix [A] into square blocks, accounting for sparsity on a block by block basis. This solver uses industry standard BLAS3 kernels and provides excellent I/O performance on extremely large problems. Typical applications include boundary integral and moment method programs. This is the default for full matrices. 

MFMAT=3: Slab Solver Extends the functionality of the Block Solver by providing full column partial pivoting for full nonsymmetric matrices. You must explicitly set MFMAT to select this option. 
FMS stores the matrix data on three separate files:
 File LUA(1) contains the terms in the lower triangle, [AL]
 File LUA(2) contains the matrix diagonals as a single vector, {D}
 File LUA(3) contains the terms in the upper triangle,[AU]
For symmetric matrices this file is not used.
FMS uses a single vector {LOWEQ} to describe the sparsity of the matrix. This vector contains the lowest coupled equation for each equation. For terms in the lower triangle [AL] this is the first nonzero term of each row, proceeding from the left edge of the matrix toward the diagonal. For terms in the upper triangle [AU] this is the first nonzero term of each column, proceeding from the top of the matrix toward the diagonal. Because FMS uses symmetric storage, the same profile vector {LOWEQ} describes both the sparsity of [AL] and [AU]. Note that for a full matrix, the profile vector {LOWEQ} would contain all 1's.