LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
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◆ zqlt03()

subroutine zqlt03 ( integer  m,
integer  n,
integer  k,
complex*16, dimension( lda, * )  af,
complex*16, dimension( lda, * )  c,
complex*16, dimension( lda, * )  cc,
complex*16, dimension( lda, * )  q,
integer  lda,
complex*16, dimension( * )  tau,
complex*16, dimension( lwork )  work,
integer  lwork,
double precision, dimension( * )  rwork,
double precision, dimension( * )  result 
)

ZQLT03

Purpose:
 ZQLT03 tests ZUNMQL, which computes Q*C, Q'*C, C*Q or C*Q'.

 ZQLT03 compares the results of a call to ZUNMQL with the results of
 forming Q explicitly by a call to ZUNGQL and then performing matrix
 multiplication by a call to ZGEMM.
Parameters
[in]M
          M is INTEGER
          The order of the orthogonal matrix Q.  M >= 0.
[in]N
          N is INTEGER
          The number of rows or columns of the matrix C; C is m-by-n if
          Q is applied from the left, or n-by-m if Q is applied from
          the right.  N >= 0.
[in]K
          K is INTEGER
          The number of elementary reflectors whose product defines the
          orthogonal matrix Q.  M >= K >= 0.
[in]AF
          AF is COMPLEX*16 array, dimension (LDA,N)
          Details of the QL factorization of an m-by-n matrix, as
          returned by ZGEQLF. See CGEQLF for further details.
[out]C
          C is COMPLEX*16 array, dimension (LDA,N)
[out]CC
          CC is COMPLEX*16 array, dimension (LDA,N)
[out]Q
          Q is COMPLEX*16 array, dimension (LDA,M)
[in]LDA
          LDA is INTEGER
          The leading dimension of the arrays AF, C, CC, and Q.
[in]TAU
          TAU is COMPLEX*16 array, dimension (min(M,N))
          The scalar factors of the elementary reflectors corresponding
          to the QL factorization in AF.
[out]WORK
          WORK is COMPLEX*16 array, dimension (LWORK)
[in]LWORK
          LWORK is INTEGER
          The length of WORK.  LWORK must be at least M, and should be
          M*NB, where NB is the blocksize for this environment.
[out]RWORK
          RWORK is DOUBLE PRECISION array, dimension (M)
[out]RESULT
          RESULT is DOUBLE PRECISION array, dimension (4)
          The test ratios compare two techniques for multiplying a
          random matrix C by an m-by-m orthogonal matrix Q.
          RESULT(1) = norm( Q*C - Q*C )  / ( M * norm(C) * EPS )
          RESULT(2) = norm( C*Q - C*Q )  / ( M * norm(C) * EPS )
          RESULT(3) = norm( Q'*C - Q'*C )/ ( M * norm(C) * EPS )
          RESULT(4) = norm( C*Q' - C*Q' )/ ( M * norm(C) * EPS )
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.

Definition at line 134 of file zqlt03.f.

136*
137* -- LAPACK test routine --
138* -- LAPACK is a software package provided by Univ. of Tennessee, --
139* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
140*
141* .. Scalar Arguments ..
142 INTEGER K, LDA, LWORK, M, N
143* ..
144* .. Array Arguments ..
145 DOUBLE PRECISION RESULT( * ), RWORK( * )
146 COMPLEX*16 AF( LDA, * ), C( LDA, * ), CC( LDA, * ),
147 $ Q( LDA, * ), TAU( * ), WORK( LWORK )
148* ..
149*
150* =====================================================================
151*
152* .. Parameters ..
153 DOUBLE PRECISION ZERO, ONE
154 parameter( zero = 0.0d+0, one = 1.0d+0 )
155 COMPLEX*16 ROGUE
156 parameter( rogue = ( -1.0d+10, -1.0d+10 ) )
157* ..
158* .. Local Scalars ..
159 CHARACTER SIDE, TRANS
160 INTEGER INFO, ISIDE, ITRANS, J, MC, MINMN, NC
161 DOUBLE PRECISION CNORM, EPS, RESID
162* ..
163* .. External Functions ..
164 LOGICAL LSAME
165 DOUBLE PRECISION DLAMCH, ZLANGE
166 EXTERNAL lsame, dlamch, zlange
167* ..
168* .. External Subroutines ..
169 EXTERNAL zgemm, zlacpy, zlarnv, zlaset, zungql, zunmql
170* ..
171* .. Local Arrays ..
172 INTEGER ISEED( 4 )
173* ..
174* .. Intrinsic Functions ..
175 INTRINSIC dble, dcmplx, max, min
176* ..
177* .. Scalars in Common ..
178 CHARACTER*32 SRNAMT
179* ..
180* .. Common blocks ..
181 COMMON / srnamc / srnamt
182* ..
183* .. Data statements ..
184 DATA iseed / 1988, 1989, 1990, 1991 /
185* ..
186* .. Executable Statements ..
187*
188 eps = dlamch( 'Epsilon' )
189 minmn = min( m, n )
190*
191* Quick return if possible
192*
193 IF( minmn.EQ.0 ) THEN
194 result( 1 ) = zero
195 result( 2 ) = zero
196 result( 3 ) = zero
197 result( 4 ) = zero
198 RETURN
199 END IF
200*
201* Copy the last k columns of the factorization to the array Q
202*
203 CALL zlaset( 'Full', m, m, rogue, rogue, q, lda )
204 IF( k.GT.0 .AND. m.GT.k )
205 $ CALL zlacpy( 'Full', m-k, k, af( 1, n-k+1 ), lda,
206 $ q( 1, m-k+1 ), lda )
207 IF( k.GT.1 )
208 $ CALL zlacpy( 'Upper', k-1, k-1, af( m-k+1, n-k+2 ), lda,
209 $ q( m-k+1, m-k+2 ), lda )
210*
211* Generate the m-by-m matrix Q
212*
213 srnamt = 'ZUNGQL'
214 CALL zungql( m, m, k, q, lda, tau( minmn-k+1 ), work, lwork,
215 $ info )
216*
217 DO 30 iside = 1, 2
218 IF( iside.EQ.1 ) THEN
219 side = 'L'
220 mc = m
221 nc = n
222 ELSE
223 side = 'R'
224 mc = n
225 nc = m
226 END IF
227*
228* Generate MC by NC matrix C
229*
230 DO 10 j = 1, nc
231 CALL zlarnv( 2, iseed, mc, c( 1, j ) )
232 10 CONTINUE
233 cnorm = zlange( '1', mc, nc, c, lda, rwork )
234 IF( cnorm.EQ.zero )
235 $ cnorm = one
236*
237 DO 20 itrans = 1, 2
238 IF( itrans.EQ.1 ) THEN
239 trans = 'N'
240 ELSE
241 trans = 'C'
242 END IF
243*
244* Copy C
245*
246 CALL zlacpy( 'Full', mc, nc, c, lda, cc, lda )
247*
248* Apply Q or Q' to C
249*
250 srnamt = 'ZUNMQL'
251 IF( k.GT.0 )
252 $ CALL zunmql( side, trans, mc, nc, k, af( 1, n-k+1 ), lda,
253 $ tau( minmn-k+1 ), cc, lda, work, lwork,
254 $ info )
255*
256* Form explicit product and subtract
257*
258 IF( lsame( side, 'L' ) ) THEN
259 CALL zgemm( trans, 'No transpose', mc, nc, mc,
260 $ dcmplx( -one ), q, lda, c, lda,
261 $ dcmplx( one ), cc, lda )
262 ELSE
263 CALL zgemm( 'No transpose', trans, mc, nc, nc,
264 $ dcmplx( -one ), c, lda, q, lda,
265 $ dcmplx( one ), cc, lda )
266 END IF
267*
268* Compute error in the difference
269*
270 resid = zlange( '1', mc, nc, cc, lda, rwork )
271 result( ( iside-1 )*2+itrans ) = resid /
272 $ ( dble( max( 1, m ) )*cnorm*eps )
273*
274 20 CONTINUE
275 30 CONTINUE
276*
277 RETURN
278*
279* End of ZQLT03
280*
zgemm
subroutine zgemm(transa, transb, m, n, k, alpha, a, lda, b, ldb, beta, c, ldc)
ZGEMM
Definition zgemm.f:188
zlacpy
subroutine zlacpy(uplo, m, n, a, lda, b, ldb)
ZLACPY copies all or part of one two-dimensional array to another.
Definition zlacpy.f:103
dlamch
double precision function dlamch(cmach)
DLAMCH
Definition dlamch.f:69
zlange
double precision function zlange(norm, m, n, a, lda, work)
ZLANGE returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value ...
Definition zlange.f:115
zlarnv
subroutine zlarnv(idist, iseed, n, x)
ZLARNV returns a vector of random numbers from a uniform or normal distribution.
Definition zlarnv.f:99
zlaset
subroutine zlaset(uplo, m, n, alpha, beta, a, lda)
ZLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.
Definition zlaset.f:106
lsame
logical function lsame(ca, cb)
LSAME
Definition lsame.f:48
zungql
subroutine zungql(m, n, k, a, lda, tau, work, lwork, info)
ZUNGQL
Definition zungql.f:128
zunmql
subroutine zunmql(side, trans, m, n, k, a, lda, tau, c, ldc, work, lwork, info)
ZUNMQL
Definition zunmql.f:167
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