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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/DEPRECATED/dgeqrs.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/DEPRECATED/dgeqrs.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/DEPRECATED/dgeqrs.f

SYNOPSIS

Functions/Subroutines


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

Function/Subroutine Documentation

subroutine DGEQRS (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)

DGEQRS

Purpose:

!>
!> Solve the least squares problem
!>     min || A*X - B ||
!> using the QR factorization
!>     A = Q*R
!> computed by DGEQRF.
!>

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.  M >= N >= 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 QR factorization of the original matrix A as
!>          returned by DGEQRF.
!>

LDA

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

TAU

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

B

!>          B is DOUBLE PRECISION array, dimension (LDB,NRHS)
!>          On entry, the m-by-nrhs right hand side matrix B.
!>          On exit, the n-by-nrhs solution matrix X.
!>

LDB

!>          LDB is INTEGER
!>          The leading dimension of the array B. LDB >= M.
!>

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 119 of file dgeqrs.f.

Author

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Version 3.12.0 LAPACK