TESTING/LIN/dgerqs.f(3) | Library Functions Manual | TESTING/LIN/dgerqs.f(3) |
NAME
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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