

 
Manual Reference Pages  SDTTRSV (l)
NAME
SDTTRSV  solve one of the systems of equations L * X = B, L**T * X = B, or L**H * X = B,
CONTENTS
Synopsis
Purpose
Arguments
SYNOPSIS
SUBROUTINE SDTTRSV(

UPLO, TRANS, N, NRHS, DL, D, DU,
B, LDB, INFO )


CHARACTER
UPLO, TRANS


INTEGER
INFO, LDB, N, NRHS


REAL
B( LDB, * ), D( * ), DL( * ), DU( * )


PURPOSE
SDTTRSV solves one of the systems of equations L * X = B, L**T * X = B, or L**H * X = B, U * X = B, U**T * X = B, or U**H * X = B,
with factors of the tridiagonal matrix A from the LU factorization
computed by SDTTRF.
ARGUMENTS
UPLO (input) CHARACTER*1
 
Specifies whether to solve with L or U.

TRANS (input) CHARACTER
 
Specifies the form of the system of equations:
= ’N’: A * X = B (No transpose)
= ’T’: A**T * X = B (Transpose)
= ’C’: A**H * X = B (Conjugate transpose)

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.

DL (input) COMPLEX array, dimension (N1)
 
The (n1) multipliers that define the matrix L from the
LU factorization of A.

D (input) COMPLEX array, dimension (N)
 
The n diagonal elements of the upper triangular matrix U from
the LU factorization of A.

DU (input) COMPLEX array, dimension (N1)
 
The (n1) elements of the first superdiagonal of U.

B (input/output) COMPLEX array, dimension (LDB,NRHS)
 
On entry, the right hand side matrix B.
On exit, B is overwritten by 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 ith argument had an illegal value


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