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SUBROUTINE CLQT02( M, N, K, A, AF, Q, L, LDA, TAU, WORK, LWORK,
$ RWORK, RESULT )
*
* -- LAPACK test routine (version 3.0) --
* Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
* Courant Institute, Argonne National Lab, and Rice University
* September 30, 1994
*
* .. Scalar Arguments ..
INTEGER K, LDA, LWORK, M, N
* ..
* .. Array Arguments ..
REAL RESULT( * ), RWORK( * )
COMPLEX A( LDA, * ), AF( LDA, * ), L( LDA, * ),
$ Q( LDA, * ), TAU( * ), WORK( LWORK )
* ..
*
* Purpose
* =======
*
* CLQT02 tests CUNGLQ, which generates an m-by-n matrix Q with
* orthonornmal rows that is defined as the product of k elementary
* reflectors.
*
* Given the LQ factorization of an m-by-n matrix A, CLQT02 generates
* the orthogonal matrix Q defined by the factorization of the first k
* rows of A; it compares L(1:k,1:m) with A(1:k,1:n)*Q(1:m,1:n)', and
* checks that the rows of Q are orthonormal.
*
* Arguments
* =========
*
* M (input) INTEGER
* The number of rows of the matrix Q to be generated. M >= 0.
*
* N (input) INTEGER
* The number of columns of the matrix Q to be generated.
* N >= M >= 0.
*
* K (input) INTEGER
* The number of elementary reflectors whose product defines the
* matrix Q. M >= K >= 0.
*
* A (input) COMPLEX array, dimension (LDA,N)
* The m-by-n matrix A which was factorized by CLQT01.
*
* AF (input) COMPLEX array, dimension (LDA,N)
* Details of the LQ factorization of A, as returned by CGELQF.
* See CGELQF for further details.
*
* Q (workspace) COMPLEX array, dimension (LDA,N)
*
* L (workspace) COMPLEX array, dimension (LDA,M)
*
* LDA (input) INTEGER
* The leading dimension of the arrays A, AF, Q and L. LDA >= N.
*
* TAU (input) COMPLEX array, dimension (M)
* The scalar factors of the elementary reflectors corresponding
* to the LQ factorization in AF.
*
* WORK (workspace) COMPLEX array, dimension (LWORK)
*
* LWORK (input) INTEGER
* The dimension of the array WORK.
*
* RWORK (workspace) REAL array, dimension (M)
*
* RESULT (output) REAL array, dimension (2)
* The test ratios:
* RESULT(1) = norm( L - A*Q' ) / ( N * norm(A) * EPS )
* RESULT(2) = norm( I - Q*Q' ) / ( N * EPS )
*
* =====================================================================
*
* .. Parameters ..
REAL ZERO, ONE
PARAMETER ( ZERO = 0.0E+0, ONE = 1.0E+0 )
COMPLEX ROGUE
PARAMETER ( ROGUE = ( -1.0E+10, -1.0E+10 ) )
* ..
* .. Local Scalars ..
INTEGER INFO
REAL ANORM, EPS, RESID
* ..
* .. External Functions ..
REAL CLANGE, CLANSY, SLAMCH
EXTERNAL CLANGE, CLANSY, SLAMCH
* ..
* .. External Subroutines ..
EXTERNAL CGEMM, CHERK, CLACPY, CLASET, CUNGLQ
* ..
* .. Intrinsic Functions ..
INTRINSIC CMPLX, MAX, REAL
* ..
* .. Scalars in Common ..
CHARACTER*6 SRNAMT
* ..
* .. Common blocks ..
COMMON / SRNAMC / SRNAMT
* ..
* .. Executable Statements ..
*
EPS = SLAMCH( 'Epsilon' )
*
* Copy the first k rows of the factorization to the array Q
*
CALL CLASET( 'Full', M, N, ROGUE, ROGUE, Q, LDA )
CALL CLACPY( 'Upper', K, N-1, AF( 1, 2 ), LDA, Q( 1, 2 ), LDA )
*
* Generate the first n columns of the matrix Q
*
SRNAMT = 'CUNGLQ'
CALL CUNGLQ( M, N, K, Q, LDA, TAU, WORK, LWORK, INFO )
*
* Copy L(1:k,1:m)
*
CALL CLASET( 'Full', K, M, CMPLX( ZERO ), CMPLX( ZERO ), L, LDA )
CALL CLACPY( 'Lower', K, M, AF, LDA, L, LDA )
*
* Compute L(1:k,1:m) - A(1:k,1:n) * Q(1:m,1:n)'
*
CALL CGEMM( 'No transpose', 'Conjugate transpose', K, M, N,
$ CMPLX( -ONE ), A, LDA, Q, LDA, CMPLX( ONE ), L, LDA )
*
* Compute norm( L - A*Q' ) / ( N * norm(A) * EPS ) .
*
ANORM = CLANGE( '1', K, N, A, LDA, RWORK )
RESID = CLANGE( '1', K, M, L, LDA, RWORK )
IF( ANORM.GT.ZERO ) THEN
RESULT( 1 ) = ( ( RESID / REAL( MAX( 1, N ) ) ) / ANORM ) / EPS
ELSE
RESULT( 1 ) = ZERO
END IF
*
* Compute I - Q*Q'
*
CALL CLASET( 'Full', M, M, CMPLX( ZERO ), CMPLX( ONE ), L, LDA )
CALL CHERK( 'Upper', 'No transpose', M, N, -ONE, Q, LDA, ONE, L,
$ LDA )
*
* Compute norm( I - Q*Q' ) / ( N * EPS ) .
*
RESID = CLANSY( '1', 'Upper', M, L, LDA, RWORK )
*
RESULT( 2 ) = ( RESID / REAL( MAX( 1, N ) ) ) / EPS
*
RETURN
*
* End of CLQT02
*
END
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