Ubuntu Feisty 7.04 manual page repository

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NAME

        ZDTTRSV  - solve one of the systems of equations  L * X = B, L**T * X =
        B, or L**H * X = B,
 

SYNOPSIS

        SUBROUTINE ZDTTRSV( UPLO, TRANS, N, NRHS, DL, D, DU, B, LDB, INFO )
 
            CHARACTER       UPLO, TRANS
 
            INTEGER         INFO, LDB, N, NRHS
 
            COMPLEX*16      B( LDB, * ), D( * ), DL( * ), DU( * )
 

PURPOSE

        ZDTTRSV 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 com‐
        puted by ZDTTRF.
 

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 fac‐
                torization 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  over‐
                written 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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