SRC/DEPRECATED/dgeqrs.f(3) | Library Functions Manual | SRC/DEPRECATED/dgeqrs.f(3) |
NAME
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
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.12.0 | LAPACK |