3 * =========== DOCUMENTATION ===========
5 * Online html documentation available at
6 * http://www.netlib.org/lapack/explore-html/
11 * SUBROUTINE ZQRT05(M,N,L,NB,RESULT)
13 * .. Scalar Arguments ..
14 * INTEGER LWORK, M, N, L, NB, LDT
16 * DOUBLE PRECISION RESULT(6)
24 *> ZQRT05 tests ZTPQRT and ZTPMQRT.
33 *> Number of rows in lower part of the test matrix.
39 *> Number of columns in test matrix.
45 *> The number of rows of the upper trapezoidal part the
46 *> lower test matrix. 0 <= L <= M.
52 *> Block size of test matrix. NB <= N.
57 *> RESULT is DOUBLE PRECISION array, dimension (6)
58 *> Results of each of the six tests below.
60 *> RESULT(1) = | A - Q R |
61 *> RESULT(2) = | I - Q^H Q |
62 *> RESULT(3) = | Q C - Q C |
63 *> RESULT(4) = | Q^H C - Q^H C |
64 *> RESULT(5) = | C Q - C Q |
65 *> RESULT(6) = | C Q^H - C Q^H |
71 *> \author Univ. of Tennessee
72 *> \author Univ. of California Berkeley
73 *> \author Univ. of Colorado Denver
78 *> \ingroup complex16_lin
80 * =====================================================================
81 SUBROUTINE ZQRT05(M,N,L,NB,RESULT)
84 * -- LAPACK test routine (version 3.6.1) --
85 * -- LAPACK is a software package provided by Univ. of Tennessee, --
86 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
89 * .. Scalar Arguments ..
90 INTEGER LWORK, M, N, L, NB, LDT
92 DOUBLE PRECISION RESULT(6)
94 * =====================================================================
97 * .. Local allocatable arrays
98 COMPLEX*16, ALLOCATABLE :: AF(:,:), Q(:,:),
99 $ R(:,:), WORK( : ), T(:,:),
100 $ CF(:,:), DF(:,:), A(:,:), C(:,:), D(:,:)
101 DOUBLE PRECISION, ALLOCATABLE :: RWORK(:)
104 DOUBLE PRECISION ZERO
105 COMPLEX*16 ONE, CZERO
106 PARAMETER( ZERO = 0.0, ONE = (1.0,0.0), CZERO=(0.0,0.0) )
108 * .. Local Scalars ..
109 INTEGER INFO, J, K, M2, NP1
110 DOUBLE PRECISION ANORM, EPS, RESID, CNORM, DNORM
115 * .. External Functions ..
116 DOUBLE PRECISION DLAMCH
117 DOUBLE PRECISION ZLANGE, ZLANSY
119 EXTERNAL DLAMCH, ZLANGE, ZLANSY, LSAME
121 * .. Data statements ..
122 DATA ISEED / 1988, 1989, 1990, 1991 /
124 EPS = DLAMCH( 'Epsilon' )
134 * Dynamically allocate all arrays
136 ALLOCATE(A(M2,N),AF(M2,N),Q(M2,M2),R(M2,M2),RWORK(M2),
137 $ WORK(LWORK),T(NB,N),C(M2,N),CF(M2,N),
140 * Put random stuff into A
143 CALL ZLASET( 'Full', M2, N, CZERO, CZERO, A, M2 )
144 CALL ZLASET( 'Full', NB, N, CZERO, CZERO, T, NB )
146 CALL ZLARNV( 2, ISEED, J, A( 1, J ) )
150 CALL ZLARNV( 2, ISEED, M-L, A( MIN(N+M,N+1), J ) )
155 CALL ZLARNV( 2, ISEED, MIN(J,L), A( MIN(N+M,N+M-L+1), J ) )
159 * Copy the matrix A to the array AF.
161 CALL ZLACPY( 'Full', M2, N, A, M2, AF, M2 )
163 * Factor the matrix A in the array AF.
165 CALL ZTPQRT( M,N,L,NB,AF,M2,AF(NP1,1),M2,T,LDT,WORK,INFO)
167 * Generate the (M+N)-by-(M+N) matrix Q by applying H to I
169 CALL ZLASET( 'Full', M2, M2, CZERO, ONE, Q, M2 )
170 CALL ZGEMQRT( 'R', 'N', M2, M2, K, NB, AF, M2, T, LDT, Q, M2,
175 CALL ZLASET( 'Full', M2, N, CZERO, CZERO, R, M2 )
176 CALL ZLACPY( 'Upper', M2, N, AF, M2, R, M2 )
178 * Compute |R - Q'*A| / |A| and store in RESULT(1)
180 CALL ZGEMM( 'C', 'N', M2, N, M2, -ONE, Q, M2, A, M2, ONE, R, M2 )
181 ANORM = ZLANGE( '1', M2, N, A, M2, RWORK )
182 RESID = ZLANGE( '1', M2, N, R, M2, RWORK )
183 IF( ANORM.GT.ZERO ) THEN
184 RESULT( 1 ) = RESID / (EPS*ANORM*MAX(1,M2))
189 * Compute |I - Q'*Q| and store in RESULT(2)
191 CALL ZLASET( 'Full', M2, M2, CZERO, ONE, R, M2 )
192 CALL ZHERK( 'U', 'C', M2, M2, DREAL(-ONE), Q, M2, DREAL(ONE),
194 RESID = ZLANSY( '1', 'Upper', M2, R, M2, RWORK )
195 RESULT( 2 ) = RESID / (EPS*MAX(1,M2))
197 * Generate random m-by-n matrix C and a copy CF
200 CALL ZLARNV( 2, ISEED, M2, C( 1, J ) )
202 CNORM = ZLANGE( '1', M2, N, C, M2, RWORK)
203 CALL ZLACPY( 'Full', M2, N, C, M2, CF, M2 )
205 * Apply Q to C as Q*C
207 CALL ZTPMQRT( 'L','N', M,N,K,L,NB,AF(NP1,1),M2,T,LDT,CF,M2,
208 $ CF(NP1,1),M2,WORK,INFO)
210 * Compute |Q*C - Q*C| / |C|
212 CALL ZGEMM( 'N', 'N', M2, N, M2, -ONE, Q, M2, C, M2, ONE, CF, M2 )
213 RESID = ZLANGE( '1', M2, N, CF, M2, RWORK )
214 IF( CNORM.GT.ZERO ) THEN
215 RESULT( 3 ) = RESID / (EPS*MAX(1,M2)*CNORM)
220 * Copy C into CF again
222 CALL ZLACPY( 'Full', M2, N, C, M2, CF, M2 )
224 * Apply Q to C as QT*C
226 CALL ZTPMQRT( 'L','C',M,N,K,L,NB,AF(NP1,1),M2,T,LDT,CF,M2,
227 $ CF(NP1,1),M2,WORK,INFO)
229 * Compute |QT*C - QT*C| / |C|
231 CALL ZGEMM('C','N',M2,N,M2,-ONE,Q,M2,C,M2,ONE,CF,M2)
232 RESID = ZLANGE( '1', M2, N, CF, M2, RWORK )
233 IF( CNORM.GT.ZERO ) THEN
234 RESULT( 4 ) = RESID / (EPS*MAX(1,M2)*CNORM)
239 * Generate random n-by-m matrix D and a copy DF
242 CALL ZLARNV( 2, ISEED, N, D( 1, J ) )
244 DNORM = ZLANGE( '1', N, M2, D, N, RWORK)
245 CALL ZLACPY( 'Full', N, M2, D, N, DF, N )
247 * Apply Q to D as D*Q
249 CALL ZTPMQRT('R','N',N,M,N,L,NB,AF(NP1,1),M2,T,LDT,DF,N,
250 $ DF(1,NP1),N,WORK,INFO)
252 * Compute |D*Q - D*Q| / |D|
254 CALL ZGEMM('N','N',N,M2,M2,-ONE,D,N,Q,M2,ONE,DF,N)
255 RESID = ZLANGE('1',N, M2,DF,N,RWORK )
256 IF( CNORM.GT.ZERO ) THEN
257 RESULT( 5 ) = RESID / (EPS*MAX(1,M2)*DNORM)
262 * Copy D into DF again
264 CALL ZLACPY('Full',N,M2,D,N,DF,N )
266 * Apply Q to D as D*QT
268 CALL ZTPMQRT('R','C',N,M,N,L,NB,AF(NP1,1),M2,T,LDT,DF,N,
269 $ DF(1,NP1),N,WORK,INFO)
272 * Compute |D*QT - D*QT| / |D|
274 CALL ZGEMM( 'N', 'C', N, M2, M2, -ONE, D, N, Q, M2, ONE, DF, N )
275 RESID = ZLANGE( '1', N, M2, DF, N, RWORK )
276 IF( CNORM.GT.ZERO ) THEN
277 RESULT( 6 ) = RESID / (EPS*MAX(1,M2)*DNORM)
282 * Deallocate all arrays
284 DEALLOCATE ( A, AF, Q, R, RWORK, WORK, T, C, D, CF, DF)