DPTTRS(3F)							    DPTTRS(3F)

NAME    [Toc]    [Back]

     DPTTRS - solve a system of	linear equations A * X = B with	a symmetric
     positive definite tridiagonal matrix A using the factorization A =
     L*D*L**T or A = U**T*D*U computed by DPTTRF

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	DPTTRS(	N, NRHS, D, E, B, LDB, INFO )

	 INTEGER	INFO, LDB, N, NRHS

	 DOUBLE		PRECISION B( LDB, * ), D( * ), E( * )

PURPOSE    [Toc]    [Back]

     DPTTRS solves a system of linear equations	A * X =	B with a symmetric
     positive definite tridiagonal matrix A using the factorization A =
     L*D*L**T or A = U**T*D*U computed by DPTTRF.  (The	two forms are
     equivalent	if A is	real.)

ARGUMENTS    [Toc]    [Back]

     N	     (input) INTEGER
	     The order of the tridiagonal 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.

     D	     (input) DOUBLE PRECISION array, dimension (N)
	     The n diagonal elements of	the diagonal matrix D from the
	     factorization computed by DPTTRF.

     E	     (input) DOUBLE PRECISION array, dimension (N-1)
	     The (n-1) off-diagonal elements of	the unit bidiagonal factor U
	     or	L from the factorization computed by DPTTRF.

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

     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
DPTTRS(3F)							    DPTTRS(3F)

NAME    [Toc]    [Back]

     DPTTRS - solve a system of	linear equations A * X = B with	a symmetric
     positive definite tridiagonal matrix A using the factorization A =
     L*D*L**T or A = U**T*D*U computed by DPTTRF

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	DPTTRS(	N, NRHS, D, E, B, LDB, INFO )

	 INTEGER	INFO, LDB, N, NRHS

	 DOUBLE		PRECISION B( LDB, * ), D( * ), E( * )

PURPOSE    [Toc]    [Back]

     DPTTRS solves a system of linear equations	A * X =	B with a symmetric
     positive definite tridiagonal matrix A using the factorization A =
     L*D*L**T or A = U**T*D*U computed by DPTTRF.  (The	two forms are
     equivalent	if A is	real.)

ARGUMENTS    [Toc]    [Back]

     N	     (input) INTEGER
	     The order of the tridiagonal 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.

     D	     (input) DOUBLE PRECISION array, dimension (N)
	     The n diagonal elements of	the diagonal matrix D from the
	     factorization computed by DPTTRF.

     E	     (input) DOUBLE PRECISION array, dimension (N-1)
	     The (n-1) off-diagonal elements of	the unit bidiagonal factor U
	     or	L from the factorization computed by DPTTRF.

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

     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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