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Man Pages


Manual Reference Pages  -  CDTTRSV (l)

NAME

CDTTRSV - 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 CDTTRSV( UPLO, TRANS, N, NRHS, DL, D, DU, B, LDB, INFO )
    CHARACTER UPLO, TRANS
    INTEGER INFO, LDB, N, NRHS
    COMPLEX B( LDB, * ), D( * ), DL( * ), DU( * )

PURPOSE

CDTTRSV 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 CDTTRF.

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 (N-1)
  The (n-1) 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 (N-1)
  The (n-1) 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 i-th argument had an illegal value
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