dstsv

NAME

dstsv - compute the solution to a system of linear equations A * X = B where A is a symmetric tridiagonal matrix

SYNOPSIS 

  SUBROUTINE DSTSV( N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO)
  INTEGER N, NRHS, LDB, INFO
  INTEGER IPIV(*)
  DOUBLE PRECISION L(*), D(*), SUBL(*), B(LDB,*)
 
  SUBROUTINE DSTSV_64( N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO)
  INTEGER*8 N, NRHS, LDB, INFO
  INTEGER*8 IPIV(*)
  DOUBLE PRECISION L(*), D(*), SUBL(*), B(LDB,*)

F95 INTERFACE 

  SUBROUTINE STSV( N, NRHS, L, D, SUBL, B, [LDB], IPIV, [INFO])
  INTEGER :: N, NRHS, LDB, INFO
  INTEGER, DIMENSION(:) :: IPIV
  REAL(8), DIMENSION(:) :: L, D, SUBL
  REAL(8), DIMENSION(:,:) :: B
 
  SUBROUTINE STSV_64( N, NRHS, L, D, SUBL, B, [LDB], IPIV, [INFO])
  INTEGER(8) :: N, NRHS, LDB, INFO
  INTEGER(8), DIMENSION(:) :: IPIV
  REAL(8), DIMENSION(:) :: L, D, SUBL
  REAL(8), DIMENSION(:,:) :: B

C INTERFACE

#include <sunperf.h>

void dstsv(int n, int nrhs, double *l, double *d, double *subl, double *b, int ldb, int *ipiv, int *info);

void dstsv_64(long n, long nrhs, double *l, double *d, double *subl, double *b, long ldb, long *ipiv, long *info);

PURPOSE

dstsv computes the solution to a system of linear equations A * X = B where A is a symmetric tridiagonal matrix.

ARGUMENTS

* N (input) 
 INTEGER

The order of the matrix A. N >= 0.

* NRHS (input)
The number of right hand sides in B.

* L (input/output) 
 REAL array, dimension (N)

On entry, the n-1 subdiagonal elements of the tridiagonal matrix A. On exit, part of the factorization of A.

* D (input/output) 
 REAL array, dimension (N)

On entry, the n diagonal elements of the tridiagonal matrix A. On exit, the n diagonal elements of the diagonal matrix D from the factorization of A.

* SUBL (output) 
 REAL array, dimension (N)

On exit, part of the factorization of A.

* B (input/output)
The columns of B contain the right hand sides.

* LDB (input)
The leading dimension of B as specified in a type or DIMENSION statement.

* IPIV (output) 
 INTEGER array, dimension (N)

On exit, the pivot indices of the factorization.

* INFO (output) 
 INTEGER