CSYTRS - solve a system of linear equations A*X = B with a
complex symmetric matrix A using the factorization A =
U*D*U**T or A = L*D*L**T computed by CSYTRF
SYNOPSIS
SUBROUTINE CSYTRS( 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
CSYTRS solves a system of linear equations A*X = B with a
complex symmetric matrix A using the factorization A =
U*D*U**T or A = L*D*L**T computed by CSYTRF.
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**T;
= 'L': Lower triangular, form is A = L*D*L**T.
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
CSYTRF.
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 struc
ture of D as determined by CSYTRF.
B (input/output) COMPLEX array, dimension (LDB,NRHS)
On entry, the right hand side matrix B. On exit,
the solution matrix X.
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 ille
gal value
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