CHETRS(l) LAPACK routine (version 1.1) CHETRS(l)
NAME
CHETRS - solve a system of linear equations A*X = B with a complex Hermi-
tian matrix A using the factorization A = U*D*U**H or A = L*D*L**H computed
by CHETRF
SYNOPSIS
SUBROUTINE CHETRS( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO )
CHARACTER UPLO
INTEGER INFO, LDA, LDB, N, NRHS
INTEGER IPIV( * )
COMPLEX A( LDA, * ), B( LDB, * )
PURPOSE
CHETRS solves a system of linear equations A*X = B with a complex Hermitian
matrix A using the factorization A = U*D*U**H or A = L*D*L**H computed by
CHETRF.
ARGUMENTS
UPLO (input) CHARACTER*1
Specifies whether the details of the factorization are stored as an
upper or lower triangular matrix. = 'U': Upper triangular, form
is A = U*D*U**H;
= 'L': Lower triangular, form is A = L*D*L**H.
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.
A (input) COMPLEX array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to obtain the
factor U or L as computed by CHETRF.
LDA (input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
IPIV (input) INTEGER array, dimension (N)
Details of the interchanges and the block structure of D as deter-
mined by CHETRF.
B (input/output) COMPLEX array, dimension (LDB,NRHS)
On entry, the right hand side matrix B. On exit, 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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