sptts2 (3p)

Name

sptts2 - solve a tridiagonal system of the form A * X = B using the L*D*L' factorization of A computed by SPTTRF

Synopsis

SUBROUTINE SPTTS2(N, NRHS, D, E, B, LDB)

INTEGER N, NRHS, LDB
REAL D(*), E(*), B(LDB,*)

SUBROUTINE SPTTS2_64(N, NRHS, D, E, B, LDB)

INTEGER*8 N, NRHS, LDB
REAL D(*), E(*), B(LDB,*)




F95 INTERFACE
SUBROUTINE PTTS2(N, NRHS, D, E, B, LDB)

INTEGER :: N, NRHS, LDB
REAL, DIMENSION(:) :: D, E
REAL, DIMENSION(:,:) :: B

SUBROUTINE PTTS2_64(N, NRHS, D, E, B, LDB)

INTEGER(8) :: N, NRHS, LDB
REAL, DIMENSION(:) :: D, E
REAL, DIMENSION(:,:) :: B




C INTERFACE
#include <sunperf.h>

void sptts2(int n, int nrhs, float *d, float *e, float *b, int ldb);

void sptts2_64(long n, long nrhs, float *d, float *e,  float  *b,  long
ldb);

Description

Oracle Solaris Studio Performance Library                           sptts2(3P)



NAME
       sptts2  -  solve  a tridiagonal system of the form  A * X = B using the
       L*D*L' factorization of A computed by SPTTRF


SYNOPSIS
       SUBROUTINE SPTTS2(N, NRHS, D, E, B, LDB)

       INTEGER N, NRHS, LDB
       REAL D(*), E(*), B(LDB,*)

       SUBROUTINE SPTTS2_64(N, NRHS, D, E, B, LDB)

       INTEGER*8 N, NRHS, LDB
       REAL D(*), E(*), B(LDB,*)




   F95 INTERFACE
       SUBROUTINE PTTS2(N, NRHS, D, E, B, LDB)

       INTEGER :: N, NRHS, LDB
       REAL, DIMENSION(:) :: D, E
       REAL, DIMENSION(:,:) :: B

       SUBROUTINE PTTS2_64(N, NRHS, D, E, B, LDB)

       INTEGER(8) :: N, NRHS, LDB
       REAL, DIMENSION(:) :: D, E
       REAL, DIMENSION(:,:) :: B




   C INTERFACE
       #include <sunperf.h>

       void sptts2(int n, int nrhs, float *d, float *e, float *b, int ldb);

       void sptts2_64(long n, long nrhs, float *d, float *e,  float  *b,  long
                 ldb);



PURPOSE
       sptts2 solves a tridiagonal system of the form
          A * X = B using the L*D*L' 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.


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


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


       D (input) The  n  diagonal  elements  of the diagonal matrix D from the
                 L*D*L' factorization of A.


       E (input) The (n-1) subdiagonal elements of the unit bidiagonal  factor
                 L from the L*D*L' factorization of A.  E can also be regarded
                 as the superdiagonal of the unit bidiagonal factor U from the
                 factorization A = U'*D*U.


       B (input/output)
                 On  entry,  the  right  hand side vectors B for the system of
                 linear equations.  On exit, the solution vectors, X.


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




                                  7 Nov 2015                        sptts2(3P)