CGBTRS (3) Linux Manual Page
cgbtrs.f –
Synopsis
Functions/Subroutines
subroutine cgbtrs (TRANS, N, KL, KU, NRHS, AB, LDAB, IPIV, B, LDB, INFO)CGBTRS
Function/Subroutine Documentation
subroutine cgbtrs (characterTRANS, integerN, integerKL, integerKU, integerNRHS, complex, dimension( ldab, * )AB, integerLDAB, integer, dimension( * )IPIV, complex, dimension( ldb, * )B, integerLDB, integerINFO)
CGBTRS Purpose:
CGBTRS solves a system of linear equations
A * X = B, A**T * X = B, or A**H * X = B
with a general band matrix A using the LU factorization computed
by CGBTRF.
Parameters:
- TRANS
TRANS is CHARACTER*1
N
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 is INTEGER
KL
The order of the matrix A. N >= 0.KL is INTEGER
KU
The number of subdiagonals within the band of A. KL >= 0.KU is INTEGER
NRHS
The number of superdiagonals within the band of A. KU >= 0.NRHS is INTEGER
AB
The number of right hand sides, i.e., the number of columns
of the matrix B. NRHS >= 0.AB is COMPLEX array, dimension (LDAB,N)
LDAB
Details of the LU factorization of the band matrix A, as
computed by CGBTRF. U is stored as an upper triangular band
matrix with KL+KU superdiagonals in rows 1 to KL+KU+1, and
the multipliers used during the factorization are stored in
rows KL+KU+2 to 2*KL+KU+1.LDAB is INTEGER
IPIV
The leading dimension of the array AB. LDAB >= 2*KL+KU+1.IPIV is INTEGER array, dimension (N)
B
The pivot indices; for 1 <= i <= N, row i of the matrix was
interchanged with row IPIV(i).B is COMPLEX array, dimension (LDB,NRHS)
LDB
On entry, the right hand side matrix B.
On exit, the solution matrix X.LDB is INTEGER
INFO
The leading dimension of the array B. LDB >= max(1,N).INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
Author:
- Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
- November 2011
Definition at line 138 of file cgbtrs.f.