subroutine dsytrs_aa_2stage (UPLO, N, NRHS, A, LDA, TB, LTB, IPIV, IPIV2, B, LDB, INFO)
DSYTRS_AA_2STAGE
DSYTRS_AA_2STAGE
Purpose:
DSYTRS_AA_2STAGE solves a system of linear equations A*X = B with a real symmetric matrix A using the factorization A = U*T*U**T or A = L*T*L**T computed by DSYTRF_AA_2STAGE.
Parameters:
UPLO is 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*T*U**T;
= 'L': Lower triangular, form is A = L*T*L**T.
N
N is INTEGER
The order of the matrix A. N >= 0.
NRHS
NRHS is INTEGER
The number of right hand sides, i.e., the number of columns
of the matrix B. NRHS >= 0.
A
A is DOUBLE PRECISION array, dimension (LDA,N)
Details of factors computed by DSYTRF_AA_2STAGE.
LDA
LDA is INTEGER
The leading dimension of the array A. LDA >= max(1,N).
TB
TB is DOUBLE PRECISION array, dimension (LTB)
Details of factors computed by DSYTRF_AA_2STAGE.
LTB
The size of the array TB. LTB >= 4*N.
IPIV
IPIV is INTEGER array, dimension (N)
Details of the interchanges as computed by
DSYTRF_AA_2STAGE.
IPIV2
IPIV2 is INTEGER array, dimension (N)
Details of the interchanges as computed by
DSYTRF_AA_2STAGE.
B
B is DOUBLE PRECISION array, dimension (LDB,NRHS)
On entry, the right hand side matrix B.
On exit, the solution matrix X.
LDB
LDB is INTEGER
The leading dimension of the array B. LDB >= max(1,N).
INFO
INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
Author:
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
Definition at line 140 of file dsytrs_aa_2stage.f.
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