SRC/spttrs.f(3)            Library Functions Manual            SRC/spttrs.f(3)

NAME
       SRC/spttrs.f

SYNOPSIS
   Functions/Subroutines
       subroutine spttrs (n, nrhs, d, e, b, ldb, info)
           SPTTRS

Function/Subroutine Documentation
   subroutine spttrs (integer n, integer nrhs, real, dimension( * ) d, real,
       dimension( * ) e, real, dimension( ldb, * ) b, integer ldb, integer
       info)
       SPTTRS

       Purpose:


            SPTTRS solves a tridiagonal system of the form
               A * X = B
            using the L*D*L**T factorization of A computed by SPTTRF.  D is a
            diagonal matrix specified in the vector D, L is a unit bidiagonal
            matrix whose subdiagonal is specified in the vector E, and X and B
            are N by NRHS matrices.

       Parameters
           N

                     N is INTEGER
                     The order of the tridiagonal matrix A.  N >= 0.

           NRHS

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

           D

                     D is REAL array, dimension (N)
                     The n diagonal elements of the diagonal matrix D from the
                     L*D*L**T factorization of A.

           E

                     E is REAL array, dimension (N-1)
                     The (n-1) subdiagonal elements of the unit bidiagonal factor
                     L from the L*D*L**T factorization of A.  E can also be regarded
                     as the superdiagonal of the unit bidiagonal factor U from the
                     factorization A = U**T*D*U.

           B

                     B is REAL array, dimension (LDB,NRHS)
                     On entry, the right hand side vectors B for the system of
                     linear equations.
                     On exit, the solution vectors, X.

           LDB

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

           INFO

                     INFO is INTEGER
                     = 0: successful exit
                     < 0: if INFO = -k, the k-th argument had an illegal value

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 108 of file spttrs.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/spttrs.f(3)