LAPACK  3.10.0
LAPACK: Linear Algebra PACKage

◆ sorhr_col02()

subroutine sorhr_col02 ( integer  M,
integer  N,
integer  MB1,
integer  NB1,
integer  NB2,
real, dimension(6)  RESULT 
)

SORHR_COL02

Purpose:
 SORHR_COL02 tests SORGTSQR_ROW and SORHR_COL inside SGETSQRHRT
 (which calls SLATSQR, SORGTSQR_ROW and SORHR_COL) using SGEMQRT.
 Therefore, SLATSQR (part of SGEQR), SGEMQRT (part of SGEMQR)
 have to be tested before this test.
Parameters
[in]M
          M is INTEGER
          Number of rows in test matrix.
[in]N
          N is INTEGER
          Number of columns in test matrix.
[in]MB1
          MB1 is INTEGER
          Number of row in row block in an input test matrix.
[in]NB1
          NB1 is INTEGER
          Number of columns in column block an input test matrix.
[in]NB2
          NB2 is INTEGER
          Number of columns in column block in an output test matrix.
[out]RESULT
          RESULT is REAL array, dimension (6)
          Results of each of the six tests below.

            A is a m-by-n test input matrix to be factored.
            so that A = Q_gr * ( R )
                               ( 0 ),

            Q_qr is an implicit m-by-m orthogonal Q matrix, the result
            of factorization in blocked WY-representation,
            stored in SGEQRT output format.

            R is a n-by-n upper-triangular matrix,

            0 is a (m-n)-by-n zero matrix,

            Q is an explicit m-by-m orthogonal matrix Q = Q_gr * I

            C is an m-by-n random matrix,

            D is an n-by-m random matrix.

          The six tests are:

          RESULT(1) = |R - (Q**H) * A| / ( eps * m * |A| )
            is equivalent to test for | A - Q * R | / (eps * m * |A|),

          RESULT(2) = |I - (Q**H) * Q| / ( eps * m ),

          RESULT(3) = | Q_qr * C - Q * C | / (eps * m * |C|),

          RESULT(4) = | (Q_gr**H) * C - (Q**H) * C | / (eps * m * |C|)

          RESULT(5) = | D * Q_qr - D * Q | / (eps * m * |D|)

          RESULT(6) = | D * (Q_qr**H) - D * (Q**H) | / (eps * m * |D|),

          where:
            Q_qr * C, (Q_gr**H) * C, D * Q_qr, D * (Q_qr**H) are
            computed using SGEMQRT,

            Q * C, (Q**H) * C, D * Q, D * (Q**H)  are
            computed using SGEMM.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.

Definition at line 119 of file sorhr_col02.f.

120  IMPLICIT NONE
121 *
122 * -- LAPACK test routine --
123 * -- LAPACK is a software package provided by Univ. of Tennessee, --
124 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
125 *
126 * .. Scalar Arguments ..
127  INTEGER M, N, MB1, NB1, NB2
128 * .. Return values ..
129  REAL RESULT(6)
130 *
131 * =====================================================================
132 *
133 * ..
134 * .. Local allocatable arrays
135  REAL , ALLOCATABLE :: A(:,:), AF(:,:), Q(:,:), R(:,:),
136  $ RWORK(:), WORK( : ), T1(:,:), T2(:,:), DIAG(:),
137  $ C(:,:), CF(:,:), D(:,:), DF(:,:)
138 *
139 * .. Parameters ..
140  REAL ONE, ZERO
141  parameter( zero = 0.0e+0, one = 1.0e+0 )
142 * ..
143 * .. Local Scalars ..
144  LOGICAL TESTZEROS
145  INTEGER INFO, J, K, L, LWORK, NB2_UB, NRB
146  REAL ANORM, EPS, RESID, CNORM, DNORM
147 * ..
148 * .. Local Arrays ..
149  INTEGER ISEED( 4 )
150  REAL WORKQUERY( 1 )
151 * ..
152 * .. External Functions ..
153  REAL SLAMCH, SLANGE, SLANSY
154  EXTERNAL slamch, slange, slansy
155 * ..
156 * .. External Subroutines ..
157  EXTERNAL slacpy, slarnv, slaset, sgetsqrhrt,
158  $ sscal, sgemm, sgemqrt, ssyrk
159 * ..
160 * .. Intrinsic Functions ..
161  INTRINSIC ceiling, real, max, min
162 * ..
163 * .. Scalars in Common ..
164  CHARACTER(LEN=32) SRNAMT
165 * ..
166 * .. Common blocks ..
167  COMMON / srmnamc / srnamt
168 * ..
169 * .. Data statements ..
170  DATA iseed / 1988, 1989, 1990, 1991 /
171 *
172 * TEST MATRICES WITH HALF OF MATRIX BEING ZEROS
173 *
174  testzeros = .false.
175 *
176  eps = slamch( 'Epsilon' )
177  k = min( m, n )
178  l = max( m, n, 1)
179 *
180 * Dynamically allocate local arrays
181 *
182  ALLOCATE ( a(m,n), af(m,n), q(l,l), r(m,l), rwork(l),
183  $ c(m,n), cf(m,n),
184  $ d(n,m), df(n,m) )
185 *
186 * Put random numbers into A and copy to AF
187 *
188  DO j = 1, n
189  CALL slarnv( 2, iseed, m, a( 1, j ) )
190  END DO
191  IF( testzeros ) THEN
192  IF( m.GE.4 ) THEN
193  DO j = 1, n
194  CALL slarnv( 2, iseed, m/2, a( m/4, j ) )
195  END DO
196  END IF
197  END IF
198  CALL slacpy( 'Full', m, n, a, m, af, m )
199 *
200 * Number of row blocks in SLATSQR
201 *
202  nrb = max( 1, ceiling( real( m - n ) / real( mb1 - n ) ) )
203 *
204  ALLOCATE ( t1( nb1, n * nrb ) )
205  ALLOCATE ( t2( nb2, n ) )
206  ALLOCATE ( diag( n ) )
207 *
208 * Begin determine LWORK for the array WORK and allocate memory.
209 *
210 * SGEMQRT requires NB2 to be bounded by N.
211 *
212  nb2_ub = min( nb2, n)
213 *
214  CALL sgetsqrhrt( m, n, mb1, nb1, nb2, af, m, t2, nb2,
215  $ workquery, -1, info )
216 *
217  lwork = int( workquery( 1 ) )
218 *
219 * In SGEMQRT, WORK is N*NB2_UB if SIDE = 'L',
220 * or M*NB2_UB if SIDE = 'R'.
221 *
222  lwork = max( lwork, nb2_ub * n, nb2_ub * m )
223 *
224  ALLOCATE ( work( lwork ) )
225 *
226 * End allocate memory for WORK.
227 *
228 *
229 * Begin Householder reconstruction routines
230 *
231 * Factor the matrix A in the array AF.
232 *
233  srnamt = 'SGETSQRHRT'
234  CALL sgetsqrhrt( m, n, mb1, nb1, nb2, af, m, t2, nb2,
235  $ work, lwork, info )
236 *
237 * End Householder reconstruction routines.
238 *
239 *
240 * Generate the m-by-m matrix Q
241 *
242  CALL slaset( 'Full', m, m, zero, one, q, m )
243 *
244  srnamt = 'SGEMQRT'
245  CALL sgemqrt( 'L', 'N', m, m, k, nb2_ub, af, m, t2, nb2, q, m,
246  $ work, info )
247 *
248 * Copy R
249 *
250  CALL slaset( 'Full', m, n, zero, zero, r, m )
251 *
252  CALL slacpy( 'Upper', m, n, af, m, r, m )
253 *
254 * TEST 1
255 * Compute |R - (Q**T)*A| / ( eps * m * |A| ) and store in RESULT(1)
256 *
257  CALL sgemm( 'T', 'N', m, n, m, -one, q, m, a, m, one, r, m )
258 *
259  anorm = slange( '1', m, n, a, m, rwork )
260  resid = slange( '1', m, n, r, m, rwork )
261  IF( anorm.GT.zero ) THEN
262  result( 1 ) = resid / ( eps * max( 1, m ) * anorm )
263  ELSE
264  result( 1 ) = zero
265  END IF
266 *
267 * TEST 2
268 * Compute |I - (Q**T)*Q| / ( eps * m ) and store in RESULT(2)
269 *
270  CALL slaset( 'Full', m, m, zero, one, r, m )
271  CALL ssyrk( 'U', 'T', m, m, -one, q, m, one, r, m )
272  resid = slansy( '1', 'Upper', m, r, m, rwork )
273  result( 2 ) = resid / ( eps * max( 1, m ) )
274 *
275 * Generate random m-by-n matrix C
276 *
277  DO j = 1, n
278  CALL slarnv( 2, iseed, m, c( 1, j ) )
279  END DO
280  cnorm = slange( '1', m, n, c, m, rwork )
281  CALL slacpy( 'Full', m, n, c, m, cf, m )
282 *
283 * Apply Q to C as Q*C = CF
284 *
285  srnamt = 'SGEMQRT'
286  CALL sgemqrt( 'L', 'N', m, n, k, nb2_ub, af, m, t2, nb2, cf, m,
287  $ work, info )
288 *
289 * TEST 3
290 * Compute |CF - Q*C| / ( eps * m * |C| )
291 *
292  CALL sgemm( 'N', 'N', m, n, m, -one, q, m, c, m, one, cf, m )
293  resid = slange( '1', m, n, cf, m, rwork )
294  IF( cnorm.GT.zero ) THEN
295  result( 3 ) = resid / ( eps * max( 1, m ) * cnorm )
296  ELSE
297  result( 3 ) = zero
298  END IF
299 *
300 * Copy C into CF again
301 *
302  CALL slacpy( 'Full', m, n, c, m, cf, m )
303 *
304 * Apply Q to C as (Q**T)*C = CF
305 *
306  srnamt = 'SGEMQRT'
307  CALL sgemqrt( 'L', 'T', m, n, k, nb2_ub, af, m, t2, nb2, cf, m,
308  $ work, info )
309 *
310 * TEST 4
311 * Compute |CF - (Q**T)*C| / ( eps * m * |C|)
312 *
313  CALL sgemm( 'T', 'N', m, n, m, -one, q, m, c, m, one, cf, m )
314  resid = slange( '1', m, n, cf, m, rwork )
315  IF( cnorm.GT.zero ) THEN
316  result( 4 ) = resid / ( eps * max( 1, m ) * cnorm )
317  ELSE
318  result( 4 ) = zero
319  END IF
320 *
321 * Generate random n-by-m matrix D and a copy DF
322 *
323  DO j = 1, m
324  CALL slarnv( 2, iseed, n, d( 1, j ) )
325  END DO
326  dnorm = slange( '1', n, m, d, n, rwork )
327  CALL slacpy( 'Full', n, m, d, n, df, n )
328 *
329 * Apply Q to D as D*Q = DF
330 *
331  srnamt = 'SGEMQRT'
332  CALL sgemqrt( 'R', 'N', n, m, k, nb2_ub, af, m, t2, nb2, df, n,
333  $ work, info )
334 *
335 * TEST 5
336 * Compute |DF - D*Q| / ( eps * m * |D| )
337 *
338  CALL sgemm( 'N', 'N', n, m, m, -one, d, n, q, m, one, df, n )
339  resid = slange( '1', n, m, df, n, rwork )
340  IF( dnorm.GT.zero ) THEN
341  result( 5 ) = resid / ( eps * max( 1, m ) * dnorm )
342  ELSE
343  result( 5 ) = zero
344  END IF
345 *
346 * Copy D into DF again
347 *
348  CALL slacpy( 'Full', n, m, d, n, df, n )
349 *
350 * Apply Q to D as D*QT = DF
351 *
352  srnamt = 'SGEMQRT'
353  CALL sgemqrt( 'R', 'T', n, m, k, nb2_ub, af, m, t2, nb2, df, n,
354  $ work, info )
355 *
356 * TEST 6
357 * Compute |DF - D*(Q**T)| / ( eps * m * |D| )
358 *
359  CALL sgemm( 'N', 'T', n, m, m, -one, d, n, q, m, one, df, n )
360  resid = slange( '1', n, m, df, n, rwork )
361  IF( dnorm.GT.zero ) THEN
362  result( 6 ) = resid / ( eps * max( 1, m ) * dnorm )
363  ELSE
364  result( 6 ) = zero
365  END IF
366 *
367 * Deallocate all arrays
368 *
369  DEALLOCATE ( a, af, q, r, rwork, work, t1, t2, diag,
370  $ c, d, cf, df )
371 *
372  RETURN
373 *
374 * End of SORHR_COL02
375 *
subroutine slarnv(IDIST, ISEED, N, X)
SLARNV returns a vector of random numbers from a uniform or normal distribution.
Definition: slarnv.f:97
subroutine slaset(UPLO, M, N, ALPHA, BETA, A, LDA)
SLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.
Definition: slaset.f:110
subroutine slacpy(UPLO, M, N, A, LDA, B, LDB)
SLACPY copies all or part of one two-dimensional array to another.
Definition: slacpy.f:103
real function slange(NORM, M, N, A, LDA, WORK)
SLANGE returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value ...
Definition: slange.f:114
subroutine sgemqrt(SIDE, TRANS, M, N, K, NB, V, LDV, T, LDT, C, LDC, WORK, INFO)
SGEMQRT
Definition: sgemqrt.f:168
real function slansy(NORM, UPLO, N, A, LDA, WORK)
SLANSY returns the value of the 1-norm, or the Frobenius norm, or the infinity norm,...
Definition: slansy.f:122
subroutine sscal(N, SA, SX, INCX)
SSCAL
Definition: sscal.f:79
subroutine ssyrk(UPLO, TRANS, N, K, ALPHA, A, LDA, BETA, C, LDC)
SSYRK
Definition: ssyrk.f:169
subroutine sgemm(TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC)
SGEMM
Definition: sgemm.f:187
subroutine sgetsqrhrt(M, N, MB1, NB1, NB2, A, LDA, T, LDT, WORK, LWORK, INFO)
SGETSQRHRT
Definition: sgetsqrhrt.f:179
real function slamch(CMACH)
SLAMCH
Definition: slamch.f:68
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