crqt02.f - Man Page
TESTING/LIN/crqt02.f
Synopsis
Functions/Subroutines
subroutine crqt02 (m, n, k, a, af, q, r, lda, tau, work, lwork, rwork, result)
CRQT02
Function/Subroutine Documentation
subroutine crqt02 (integer m, integer n, integer k, complex, dimension( lda, * ) a, complex, dimension( lda, * ) af, complex, dimension( lda, * ) q, complex, dimension( lda, * ) r, integer lda, complex, dimension( * ) tau, complex, dimension( lwork ) work, integer lwork, real, dimension( * ) rwork, real, dimension( * ) result)
CRQT02
Purpose:
CRQT02 tests CUNGRQ, which generates an m-by-n matrix Q with orthonormal rows that is defined as the product of k elementary reflectors. Given the RQ factorization of an m-by-n matrix A, CRQT02 generates the orthogonal matrix Q defined by the factorization of the last k rows of A; it compares R(m-k+1:m,n-m+1:n) with A(m-k+1:m,1:n)*Q(n-m+1:n,1:n)', and checks that the rows of Q are orthonormal.
- Parameters
M
M is INTEGER The number of rows of the matrix Q to be generated. M >= 0.
N
N is INTEGER The number of columns of the matrix Q to be generated. N >= M >= 0.
K
K is INTEGER The number of elementary reflectors whose product defines the matrix Q. M >= K >= 0.
A
A is COMPLEX array, dimension (LDA,N) The m-by-n matrix A which was factorized by CRQT01.
AF
AF is COMPLEX array, dimension (LDA,N) Details of the RQ factorization of A, as returned by CGERQF. See CGERQF for further details.
Q
Q is COMPLEX array, dimension (LDA,N)
R
R is COMPLEX array, dimension (LDA,M)
LDA
LDA is INTEGER The leading dimension of the arrays A, AF, Q and L. LDA >= N.
TAU
TAU is COMPLEX array, dimension (M) The scalar factors of the elementary reflectors corresponding to the RQ factorization in AF.
WORK
WORK is COMPLEX array, dimension (LWORK)
LWORK
LWORK is INTEGER The dimension of the array WORK.
RWORK
RWORK is REAL array, dimension (M)
RESULT
RESULT is REAL array, dimension (2) The test ratios: RESULT(1) = norm( R - 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 134 of file crqt02.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Referenced By
The man page crqt02(3) is an alias of crqt02.f(3).
Tue Nov 28 2023 12:08:42 Version 3.12.0 LAPACK