cgtts2 (l)  Linux Manuals
cgtts2: solves one of the systems of equations A * X = B, A**T * X = B, or A**H * X = B,
NAME
CGTTS2  solves one of the systems of equations A * X = B, A**T * X = B, or A**H * X = B,SYNOPSIS
 SUBROUTINE CGTTS2(
 ITRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB )
 INTEGER ITRANS, LDB, N, NRHS
 INTEGER IPIV( * )
 COMPLEX B( LDB, * ), D( * ), DL( * ), DU( * ), DU2( * )
PURPOSE
CGTTS2 solves one of the systems of equationsA
ARGUMENTS
 ITRANS (input) INTEGER

Specifies the form of the system of equations.
= 0: A * X = B (No transpose)
= 1: A**T * X = B (Transpose)
= 2: A**H * X = B (Conjugate transpose)  N (input) INTEGER
 The order of the matrix A.
 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.
 DU2 (input) COMPLEX array, dimension (N2)
 The (n2) elements of the second superdiagonal of U.
 IPIV (input) INTEGER array, dimension (N)
 The pivot indices; for 1 <= i <= n, row i of the matrix was interchanged with row IPIV(i). IPIV(i) will always be either i or i+1; IPIV(i) = i indicates a row interchange was not required.
 B (input/output) COMPLEX array, dimension (LDB,NRHS)
 On entry, the matrix of right hand side vectors B. On exit, B is overwritten by the solution vectors X.
 LDB (input) INTEGER

The leading dimension of the array B. LDB >= max(1,N).