--- rpl/lapack/lapack/zherfs.f 2011/07/22 07:38:15 1.8 +++ rpl/lapack/lapack/zherfs.f 2011/11/21 20:43:12 1.9 @@ -1,12 +1,201 @@ +*> \brief \b ZHERFS +* +* =========== DOCUMENTATION =========== +* +* Online html documentation available at +* http://www.netlib.org/lapack/explore-html/ +* +*> \htmlonly +*> Download ZHERFS + dependencies +*> +*> [TGZ] +*> +*> [ZIP] +*> +*> [TXT] +*> \endhtmlonly +* +* Definition: +* =========== +* +* SUBROUTINE ZHERFS( UPLO, N, NRHS, A, LDA, AF, LDAF, IPIV, B, LDB, +* X, LDX, FERR, BERR, WORK, RWORK, INFO ) +* +* .. Scalar Arguments .. +* CHARACTER UPLO +* INTEGER INFO, LDA, LDAF, LDB, LDX, N, NRHS +* .. +* .. Array Arguments .. +* INTEGER IPIV( * ) +* DOUBLE PRECISION BERR( * ), FERR( * ), RWORK( * ) +* COMPLEX*16 A( LDA, * ), AF( LDAF, * ), B( LDB, * ), +* $ WORK( * ), X( LDX, * ) +* .. +* +* +*> \par Purpose: +* ============= +*> +*> \verbatim +*> +*> ZHERFS improves the computed solution to a system of linear +*> equations when the coefficient matrix is Hermitian indefinite, and +*> provides error bounds and backward error estimates for the solution. +*> \endverbatim +* +* Arguments: +* ========== +* +*> \param[in] UPLO +*> \verbatim +*> UPLO is CHARACTER*1 +*> = 'U': Upper triangle of A is stored; +*> = 'L': Lower triangle of A is stored. +*> \endverbatim +*> +*> \param[in] N +*> \verbatim +*> N is INTEGER +*> The order of the matrix A. N >= 0. +*> \endverbatim +*> +*> \param[in] NRHS +*> \verbatim +*> NRHS is INTEGER +*> The number of right hand sides, i.e., the number of columns +*> of the matrices B and X. NRHS >= 0. +*> \endverbatim +*> +*> \param[in] A +*> \verbatim +*> A is COMPLEX*16 array, dimension (LDA,N) +*> The Hermitian matrix A. If UPLO = 'U', the leading N-by-N +*> upper triangular part of A contains the upper triangular part +*> of the matrix A, and the strictly lower triangular part of A +*> is not referenced. If UPLO = 'L', the leading N-by-N lower +*> triangular part of A contains the lower triangular part of +*> the matrix A, and the strictly upper triangular part of A is +*> not referenced. +*> \endverbatim +*> +*> \param[in] LDA +*> \verbatim +*> LDA is INTEGER +*> The leading dimension of the array A. LDA >= max(1,N). +*> \endverbatim +*> +*> \param[in] AF +*> \verbatim +*> AF is COMPLEX*16 array, dimension (LDAF,N) +*> The factored form of the matrix A. AF contains the block +*> diagonal matrix D and the multipliers used to obtain the +*> factor U or L from the factorization A = U*D*U**H or +*> A = L*D*L**H as computed by ZHETRF. +*> \endverbatim +*> +*> \param[in] LDAF +*> \verbatim +*> LDAF is INTEGER +*> The leading dimension of the array AF. LDAF >= max(1,N). +*> \endverbatim +*> +*> \param[in] IPIV +*> \verbatim +*> IPIV is INTEGER array, dimension (N) +*> Details of the interchanges and the block structure of D +*> as determined by ZHETRF. +*> \endverbatim +*> +*> \param[in] B +*> \verbatim +*> B is COMPLEX*16 array, dimension (LDB,NRHS) +*> The right hand side matrix B. +*> \endverbatim +*> +*> \param[in] LDB +*> \verbatim +*> LDB is INTEGER +*> The leading dimension of the array B. LDB >= max(1,N). +*> \endverbatim +*> +*> \param[in,out] X +*> \verbatim +*> X is COMPLEX*16 array, dimension (LDX,NRHS) +*> On entry, the solution matrix X, as computed by ZHETRS. +*> On exit, the improved solution matrix X. +*> \endverbatim +*> +*> \param[in] LDX +*> \verbatim +*> LDX is INTEGER +*> The leading dimension of the array X. LDX >= max(1,N). +*> \endverbatim +*> +*> \param[out] FERR +*> \verbatim +*> FERR is DOUBLE PRECISION array, dimension (NRHS) +*> The estimated forward error bound for each solution vector +*> X(j) (the j-th column of the solution matrix X). +*> If XTRUE is the true solution corresponding to X(j), FERR(j) +*> is an estimated upper bound for the magnitude of the largest +*> element in (X(j) - XTRUE) divided by the magnitude of the +*> largest element in X(j). The estimate is as reliable as +*> the estimate for RCOND, and is almost always a slight +*> overestimate of the true error. +*> \endverbatim +*> +*> \param[out] BERR +*> \verbatim +*> BERR is DOUBLE PRECISION array, dimension (NRHS) +*> The componentwise relative backward error of each solution +*> vector X(j) (i.e., the smallest relative change in +*> any element of A or B that makes X(j) an exact solution). +*> \endverbatim +*> +*> \param[out] WORK +*> \verbatim +*> WORK is COMPLEX*16 array, dimension (2*N) +*> \endverbatim +*> +*> \param[out] RWORK +*> \verbatim +*> RWORK is DOUBLE PRECISION array, dimension (N) +*> \endverbatim +*> +*> \param[out] INFO +*> \verbatim +*> INFO is INTEGER +*> = 0: successful exit +*> < 0: if INFO = -i, the i-th argument had an illegal value +*> \endverbatim +* +*> \par Internal Parameters: +* ========================= +*> +*> \verbatim +*> ITMAX is the maximum number of steps of iterative refinement. +*> \endverbatim +* +* Authors: +* ======== +* +*> \author Univ. of Tennessee +*> \author Univ. of California Berkeley +*> \author Univ. of Colorado Denver +*> \author NAG Ltd. +* +*> \date November 2011 +* +*> \ingroup complex16HEcomputational +* +* ===================================================================== SUBROUTINE ZHERFS( UPLO, N, NRHS, A, LDA, AF, LDAF, IPIV, B, LDB, $ X, LDX, FERR, BERR, WORK, RWORK, INFO ) * -* -- LAPACK routine (version 3.2) -- +* -- LAPACK computational routine (version 3.4.0) -- * -- LAPACK is a software package provided by Univ. of Tennessee, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- -* November 2006 -* -* Modified to call ZLACN2 in place of ZLACON, 10 Feb 03, SJH. +* November 2011 * * .. Scalar Arguments .. CHARACTER UPLO @@ -19,93 +208,6 @@ $ WORK( * ), X( LDX, * ) * .. * -* Purpose -* ======= -* -* ZHERFS improves the computed solution to a system of linear -* equations when the coefficient matrix is Hermitian indefinite, and -* provides error bounds and backward error estimates for the solution. -* -* Arguments -* ========= -* -* UPLO (input) CHARACTER*1 -* = 'U': Upper triangle of A is stored; -* = 'L': Lower triangle of A is stored. -* -* 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 matrices B and X. NRHS >= 0. -* -* A (input) COMPLEX*16 array, dimension (LDA,N) -* The Hermitian matrix A. If UPLO = 'U', the leading N-by-N -* upper triangular part of A contains the upper triangular part -* of the matrix A, and the strictly lower triangular part of A -* is not referenced. If UPLO = 'L', the leading N-by-N lower -* triangular part of A contains the lower triangular part of -* the matrix A, and the strictly upper triangular part of A is -* not referenced. -* -* LDA (input) INTEGER -* The leading dimension of the array A. LDA >= max(1,N). -* -* AF (input) COMPLEX*16 array, dimension (LDAF,N) -* The factored form of the matrix A. AF contains the block -* diagonal matrix D and the multipliers used to obtain the -* factor U or L from the factorization A = U*D*U**H or -* A = L*D*L**H as computed by ZHETRF. -* -* LDAF (input) INTEGER -* The leading dimension of the array AF. LDAF >= max(1,N). -* -* IPIV (input) INTEGER array, dimension (N) -* Details of the interchanges and the block structure of D -* as determined by ZHETRF. -* -* B (input) COMPLEX*16 array, dimension (LDB,NRHS) -* The right hand side matrix B. -* -* LDB (input) INTEGER -* The leading dimension of the array B. LDB >= max(1,N). -* -* X (input/output) COMPLEX*16 array, dimension (LDX,NRHS) -* On entry, the solution matrix X, as computed by ZHETRS. -* On exit, the improved solution matrix X. -* -* LDX (input) INTEGER -* The leading dimension of the array X. LDX >= max(1,N). -* -* FERR (output) DOUBLE PRECISION array, dimension (NRHS) -* The estimated forward error bound for each solution vector -* X(j) (the j-th column of the solution matrix X). -* If XTRUE is the true solution corresponding to X(j), FERR(j) -* is an estimated upper bound for the magnitude of the largest -* element in (X(j) - XTRUE) divided by the magnitude of the -* largest element in X(j). The estimate is as reliable as -* the estimate for RCOND, and is almost always a slight -* overestimate of the true error. -* -* BERR (output) DOUBLE PRECISION array, dimension (NRHS) -* The componentwise relative backward error of each solution -* vector X(j) (i.e., the smallest relative change in -* any element of A or B that makes X(j) an exact solution). -* -* WORK (workspace) COMPLEX*16 array, dimension (2*N) -* -* RWORK (workspace) DOUBLE PRECISION array, dimension (N) -* -* INFO (output) INTEGER -* = 0: successful exit -* < 0: if INFO = -i, the i-th argument had an illegal value -* -* Internal Parameters -* =================== -* -* ITMAX is the maximum number of steps of iterative refinement. -* * ===================================================================== * * .. Parameters ..