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DDTTRSV ‐ solve one of the systems of equations L * X = B, L**T *
X = B, or L**H * X = B, SUBROUTINE DDTTRSV( UPLO, TRANS, N, NRHS,
DL, D, DU, B, LDB, INFO )
    CHARACTER UPLO, TRANS
    INTEGER INFO, LDB, N, NRHS
    DOUBLE  PRECISION  B( LDB, * ), D( * ), DL( * ), DU( * ) DDT‐
TRSV 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  factoriza‐
tion computed by DDTTRF.

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) INTE‐
GER 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,  dimen‐
sion  (N‐1)  The  (n‐1) multipliers that define the matrix L from
the LU factorization of A.  D	    (input) COMPLEX array, dimen‐
sion (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) IN‐
TEGER = 0:  successful exit
< 0:  if INFO = ‐i, the i‐th argument had an illegal value

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