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LAPACK
3.7.0
LAPACK: Linear Algebra PACKage
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subroutine cqlt02 | ( | integer | M, |
integer | N, | ||
integer | K, | ||
complex, dimension( lda, * ) | A, | ||
complex, dimension( lda, * ) | AF, | ||
complex, dimension( lda, * ) | Q, | ||
complex, dimension( lda, * ) | L, | ||
integer | LDA, | ||
complex, dimension( * ) | TAU, | ||
complex, dimension( lwork ) | WORK, | ||
integer | LWORK, | ||
real, dimension( * ) | RWORK, | ||
real, dimension( * ) | RESULT | ||
) |
CQLT02
CQLT02 tests CUNGQL, which generates an m-by-n matrix Q with orthonornmal columns that is defined as the product of k elementary reflectors. Given the QL factorization of an m-by-n matrix A, CQLT02 generates the orthogonal matrix Q defined by the factorization of the last k columns of A; it compares L(m-n+1:m,n-k+1:n) with Q(1:m,m-n+1:m)'*A(1:m,n-k+1:n), and checks that the columns of Q are orthonormal.
[in] | M | M is INTEGER The number of rows of the matrix Q to be generated. M >= 0. |
[in] | N | N is INTEGER The number of columns of the matrix Q to be generated. M >= N >= 0. |
[in] | K | K is INTEGER The number of elementary reflectors whose product defines the matrix Q. N >= K >= 0. |
[in] | A | A is COMPLEX array, dimension (LDA,N) The m-by-n matrix A which was factorized by CQLT01. |
[in] | AF | AF is COMPLEX array, dimension (LDA,N) Details of the QL factorization of A, as returned by CGEQLF. See CGEQLF for further details. |
[out] | Q | Q is COMPLEX array, dimension (LDA,N) |
[out] | L | L is COMPLEX array, dimension (LDA,N) |
[in] | LDA | LDA is INTEGER The leading dimension of the arrays A, AF, Q and L. LDA >= M. |
[in] | TAU | TAU is COMPLEX array, dimension (N) The scalar factors of the elementary reflectors corresponding to the QL factorization in AF. |
[out] | WORK | WORK is COMPLEX array, dimension (LWORK) |
[in] | LWORK | LWORK is INTEGER The dimension of the array WORK. |
[out] | RWORK | RWORK is REAL array, dimension (M) |
[out] | RESULT | RESULT is REAL array, dimension (2) The test ratios: RESULT(1) = norm( L - Q'*A ) / ( M * norm(A) * EPS ) RESULT(2) = norm( I - Q'*Q ) / ( M * EPS ) |
Definition at line 138 of file cqlt02.f.