CGTTRS
November 2006
Purpose
CGTTRS solves one of the systems of equations
A * X = B, A**T * X = B, or A**H * X = B,
with a tridiagonal matrix A using the LU factorization computed
by CGTTRF.
A * X = B, A**T * X = B, or A**H * X = B,
with a tridiagonal matrix A using the LU factorization computed
by CGTTRF.
Arguments
| TRANS |
(input) CHARACTER*1
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.
|
| 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 super-diagonal of U.
|
| DU2 |
(input) COMPLEX array, dimension (N-2)
The (n-2) elements of the second super-diagonal 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).
|
| INFO |
(output) INTEGER
= 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value |