sgeqls.f - Man Page

TESTING/LIN/sgeqls.f

Synopsis

Functions/Subroutines

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

Function/Subroutine Documentation

subroutine sgeqls (integer m, integer n, integer nrhs, real, dimension( lda, * ) a, integer lda, real, dimension( * ) tau, real, dimension( ldb, * ) b, integer ldb, real, dimension( lwork ) work, integer lwork, integer info)

SGEQLS

Purpose:

 Solve the least squares problem
     min || A*X - B ||
 using the QL factorization
     A = Q*L
 computed by SGEQLF.
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 REAL array, dimension (LDA,N)
          Details of the QL factorization of the original matrix A as
          returned by SGEQLF.

LDA

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

TAU

          TAU is REAL array, dimension (N)
          Details of the orthogonal matrix Q.

B

          B is REAL array, dimension (LDB,NRHS)
          On entry, the m-by-nrhs right hand side matrix B.
          On exit, the n-by-nrhs solution matrix X, stored in rows
          m-n+1:m.

LDB

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

WORK

          WORK is REAL 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 sgeqls.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page sgeqls(3) is an alias of sgeqls.f(3).

Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK