TESTING/LIN/zlqt01.f(3) Library Functions Manual TESTING/LIN/zlqt01.f(3)

TESTING/LIN/zlqt01.f


subroutine zlqt01 (m, n, a, af, q, l, lda, tau, work, lwork, rwork, result)
ZLQT01

ZLQT01

Purpose:

!>
!> ZLQT01 tests ZGELQF, which computes the LQ factorization of an m-by-n
!> matrix A, and partially tests ZUNGLQ which forms the n-by-n
!> orthogonal matrix Q.
!>
!> ZLQT01 compares L with A*Q', and checks that Q is orthogonal.
!> 

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 >= 0.
!> 

A

!>          A is COMPLEX*16 array, dimension (LDA,N)
!>          The m-by-n matrix A.
!> 

AF

!>          AF is COMPLEX*16 array, dimension (LDA,N)
!>          Details of the LQ factorization of A, as returned by ZGELQF.
!>          See ZGELQF for further details.
!> 

Q

!>          Q is COMPLEX*16 array, dimension (LDA,N)
!>          The n-by-n orthogonal matrix Q.
!> 

L

!>          L is COMPLEX*16 array, dimension (LDA,max(M,N))
!> 

LDA

!>          LDA is INTEGER
!>          The leading dimension of the arrays A, AF, Q and L.
!>          LDA >= max(M,N).
!> 

TAU

!>          TAU is COMPLEX*16 array, dimension (min(M,N))
!>          The scalar factors of the elementary reflectors, as returned
!>          by ZGELQF.
!> 

WORK

!>          WORK is COMPLEX*16 array, dimension (LWORK)
!> 

LWORK

!>          LWORK is INTEGER
!>          The dimension of the array WORK.
!> 

RWORK

!>          RWORK is DOUBLE PRECISION array, dimension (max(M,N))
!> 

RESULT

!>          RESULT is DOUBLE PRECISION array, dimension (2)
!>          The test ratios:
!>          RESULT(1) = norm( L - A*Q' ) / ( N * norm(A) * EPS )
!>          RESULT(2) = norm( I - Q*Q' ) / ( N * EPS )
!> 

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 124 of file zlqt01.f.

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