NAME

chetrs - solve 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

SYNOPSIS

SUBROUTINE CHETRS(
UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO )

void chetrs(char uplo, long int n, long int nrhs, complex ∗ca,
long int lda, long int ∗ipivot, complex ∗cb, long int ldb, long int ∗ 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 determined 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

Sun, Inc.  —  Last change: 20 Sep 1996