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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dgerqs.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dgerqs.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dgerqs.f

SYNOPSIS

Functions/Subroutines


subroutine DGERQS (m, n, nrhs, a, lda, tau, b, ldb, work, lwork, info)
DGERQS

Function/Subroutine Documentation

subroutine DGERQS (integer m, integer n, integer nrhs, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( * ) tau, double precision, dimension( ldb, * ) b, integer ldb, double precision, dimension( lwork ) work, integer lwork, integer info)

DGERQS

Purpose:

!>
!> Compute a minimum-norm solution
!>     min || A*X - B ||
!> using the RQ factorization
!>     A = R*Q
!> computed by DGERQF.
!>

Parameters

M 

!>          M is INTEGER
!>          The number of rows of the matrix A.  M >= 0.
!>

N

!>          N is INTEGER
!>          The number of columns of the matrix A.  N >= M >= 0.
!>

NRHS

!>          NRHS is INTEGER
!>          The number of columns of B.  NRHS >= 0.
!>

A

!>          A is DOUBLE PRECISION array, dimension (LDA,N)
!>          Details of the RQ factorization of the original matrix A as
!>          returned by DGERQF.
!>

LDA

!>          LDA is INTEGER
!>          The leading dimension of the array A.  LDA >= M.
!>

TAU

!>          TAU is DOUBLE PRECISION array, dimension (M)
!>          Details of the orthogonal matrix Q.
!>

B

!>          B is DOUBLE PRECISION array, dimension (LDB,NRHS)
!>          On entry, the right hand side vectors for the linear system.
!>          On exit, the solution vectors X.  Each solution vector
!>          is contained in rows 1:N of a column of B.
!>

LDB

!>          LDB is INTEGER
!>          The leading dimension of the array B. LDB >= max(1,N).
!>

WORK

!>          WORK is DOUBLE PRECISION array, dimension (LWORK)
!>

LWORK

!>          LWORK is INTEGER
!>          The length of the array WORK.  LWORK must be at least NRHS,
!>          and should be at least NRHS*NB, where NB is the block size
!>          for this environment.
!>

INFO

!>          INFO is INTEGER
!>          = 0: successful exit
!>          < 0: if INFO = -i, the i-th argument had an illegal value
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 120 of file dgerqs.f.

Author

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Version 3.12.0 LAPACK