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SOLVERS(3F)							   SOLVERS(3F)


NAME    [Toc]    [Back]

     SOLVERS - SGI developed linear equations solvers.

DESCRIPTION    [Toc]    [Back]

     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.
SOLVERS(3F)							   SOLVERS(3F)


NAME    [Toc]    [Back]

     SOLVERS - SGI developed linear equations solvers.

DESCRIPTION    [Toc]    [Back]

     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.


									PPPPaaaaggggeeee 1111
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