DSYTRS(3F)							    DSYTRS(3F)

NAME    [Toc]    [Back]

     DSYTRS - solve a system of	linear equations A*X = B with a	real symmetric
     matrix A using the	factorization A	= U*D*U**T or A	= L*D*L**T computed by
     DSYTRF

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	DSYTRS(	UPLO, N, NRHS, A, LDA, IPIV, B,	LDB, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, LDB,	N, NRHS

	 INTEGER	IPIV( *	)

	 DOUBLE		PRECISION A( LDA, * ), B( LDB, * )

PURPOSE    [Toc]    [Back]

     DSYTRS solves a system of linear equations	A*X = B	with a real symmetric
     matrix A using the	factorization A	= U*D*U**T or A	= L*D*L**T computed by
     DSYTRF.

ARGUMENTS    [Toc]    [Back]

     UPLO    (input) CHARACTER*1
	     Specifies whether the details of the factorization	are stored as
	     an	upper or lower triangular matrix.  = 'U':  Upper triangular,
	     form is A = U*D*U**T;
	     = 'L':  Lower triangular, form is A = L*D*L**T.

     N	     (input) INTEGER
	     The order of the matrix A.	 N >= 0.

     NRHS    (input) INTEGER
	     The number	of right hand sides, i.e., the number of columns of
	     the matrix	B.  NRHS >= 0.

     A	     (input) DOUBLE PRECISION array, dimension (LDA,N)
	     The block diagonal	matrix D and the multipliers used to obtain
	     the factor	U or L as computed by DSYTRF.

     LDA     (input) INTEGER
	     The leading dimension of the array	A.  LDA	>= max(1,N).

     IPIV    (input) INTEGER array, dimension (N)
	     Details of	the interchanges and the block structure of D as
	     determined	by DSYTRF.

     B	     (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
	     On	entry, the right hand side matrix B.  On exit, the solution
	     matrix X.





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DSYTRS(3F)							    DSYTRS(3F)



     LDB     (input) INTEGER
	     The leading dimension of the array	B.  LDB	>= max(1,N).

     INFO    (output) INTEGER
	     = 0:  successful exit
	     < 0:  if INFO = -i, the i-th argument had an illegal value
DSYTRS(3F)							    DSYTRS(3F)

NAME    [Toc]    [Back]

     DSYTRS - solve a system of	linear equations A*X = B with a	real symmetric
     matrix A using the	factorization A	= U*D*U**T or A	= L*D*L**T computed by
     DSYTRF

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	DSYTRS(	UPLO, N, NRHS, A, LDA, IPIV, B,	LDB, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, LDB,	N, NRHS

	 INTEGER	IPIV( *	)

	 DOUBLE		PRECISION A( LDA, * ), B( LDB, * )

PURPOSE    [Toc]    [Back]

     DSYTRS solves a system of linear equations	A*X = B	with a real symmetric
     matrix A using the	factorization A	= U*D*U**T or A	= L*D*L**T computed by
     DSYTRF.

ARGUMENTS    [Toc]    [Back]

     UPLO    (input) CHARACTER*1
	     Specifies whether the details of the factorization	are stored as
	     an	upper or lower triangular matrix.  = 'U':  Upper triangular,
	     form is A = U*D*U**T;
	     = 'L':  Lower triangular, form is A = L*D*L**T.

     N	     (input) INTEGER
	     The order of the matrix A.	 N >= 0.

     NRHS    (input) INTEGER
	     The number	of right hand sides, i.e., the number of columns of
	     the matrix	B.  NRHS >= 0.

     A	     (input) DOUBLE PRECISION array, dimension (LDA,N)
	     The block diagonal	matrix D and the multipliers used to obtain
	     the factor	U or L as computed by DSYTRF.

     LDA     (input) INTEGER
	     The leading dimension of the array	A.  LDA	>= max(1,N).

     IPIV    (input) INTEGER array, dimension (N)
	     Details of	the interchanges and the block structure of D as
	     determined	by DSYTRF.

     B	     (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
	     On	entry, the right hand side matrix B.  On exit, the solution
	     matrix X.





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DSYTRS(3F)							    DSYTRS(3F)



     LDB     (input) INTEGER
	     The leading dimension of the array	B.  LDB	>= max(1,N).

     INFO    (output) INTEGER
	     = 0:  successful exit
	     < 0:  if INFO = -i, the i-th argument had an illegal value


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