SOLVERS(3F)SOLVERS(3F)NAME
SOLVERS - SGI developed linear equations solvers.
DESCRIPTION
Two direct solvers for sparse linear systems of equations are available
in complib.sgimath, PSLDLT and PSLDU. These solvers are optimized and
parallelized for the SGI platforms. For direct solvers for dense linear
systems of equations, see LAPACK manpage.
PSLDLT solves sparse symmetric linear systems of the form
Ax = b
where A is an n x n symmetric input matrix, b is an input vector of
length n, and x is an unknown vector of length n. PSLDLT uses a direct
method: A is factored into the form
A = L D L-transpose
where L is a lower triangular matrix with unit diagonal and D is a
diagonal matrix.
This routine is double precision only and is available in the mp versions
of complib.sgimath.
See the manpage for PSLDLT for details.
PSLDU solves sparse unsymmetric linear systems of the form
Ax = b
where A is an n x n input matrix with symmetric non-zero pattern but
unsymmetric non-zero values, b is an input vector of length n, and x is
an unknown vector of length n. PSLDU uses a direct method: A is factored
into the form
A = L D U
where L is a lower triangular matrix with unit diagonal, D is a diagonal
matrix and U is an upper triangular matrix with unit diagonal.
See the manpage for PSLDU for details.
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