LAPACK 3.12.0 LAPACK: Linear Algebra PACKage
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## ◆ schkq3()

 subroutine schkq3 ( logical, dimension( * ) dotype, integer nm, integer, dimension( * ) mval, integer nn, integer, dimension( * ) nval, integer nnb, integer, dimension( * ) nbval, integer, dimension( * ) nxval, real thresh, real, dimension( * ) a, real, dimension( * ) copya, real, dimension( * ) s, real, dimension( * ) tau, real, dimension( * ) work, integer, dimension( * ) iwork, integer nout )

SCHKQ3

Purpose:
` SCHKQ3 tests SGEQP3.`
Parameters
 [in] DOTYPE ``` DOTYPE is LOGICAL array, dimension (NTYPES) The matrix types to be used for testing. Matrices of type j (for 1 <= j <= NTYPES) are used for testing if DOTYPE(j) = .TRUE.; if DOTYPE(j) = .FALSE., then type j is not used.``` [in] NM ``` NM is INTEGER The number of values of M contained in the vector MVAL.``` [in] MVAL ``` MVAL is INTEGER array, dimension (NM) The values of the matrix row dimension M.``` [in] NN ``` NN is INTEGER The number of values of N contained in the vector NVAL.``` [in] NVAL ``` NVAL is INTEGER array, dimension (NN) The values of the matrix column dimension N.``` [in] NNB ``` NNB is INTEGER The number of values of NB and NX contained in the vectors NBVAL and NXVAL. The blocking parameters are used in pairs (NB,NX).``` [in] NBVAL ``` NBVAL is INTEGER array, dimension (NNB) The values of the blocksize NB.``` [in] NXVAL ``` NXVAL is INTEGER array, dimension (NNB) The values of the crossover point NX.``` [in] THRESH ``` THRESH is REAL The threshold value for the test ratios. A result is included in the output file if RESULT >= THRESH. To have every test ratio printed, use THRESH = 0.``` [out] A ``` A is REAL array, dimension (MMAX*NMAX) where MMAX is the maximum value of M in MVAL and NMAX is the maximum value of N in NVAL.``` [out] COPYA ` COPYA is REAL array, dimension (MMAX*NMAX)` [out] S ``` S is REAL array, dimension (min(MMAX,NMAX))``` [out] TAU ` TAU is REAL array, dimension (MMAX)` [out] WORK ``` WORK is REAL array, dimension (MMAX*NMAX + 4*NMAX + MMAX)``` [out] IWORK ` IWORK is INTEGER array, dimension (2*NMAX)` [in] NOUT ``` NOUT is INTEGER The unit number for output.```

Definition at line 150 of file schkq3.f.

153*
154* -- LAPACK test routine --
155* -- LAPACK is a software package provided by Univ. of Tennessee, --
156* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
157*
158* .. Scalar Arguments ..
159 INTEGER NM, NN, NNB, NOUT
160 REAL THRESH
161* ..
162* .. Array Arguments ..
163 LOGICAL DOTYPE( * )
164 INTEGER IWORK( * ), MVAL( * ), NBVAL( * ), NVAL( * ),
165 \$ NXVAL( * )
166 REAL A( * ), COPYA( * ), S( * ),
167 \$ TAU( * ), WORK( * )
168* ..
169*
170* =====================================================================
171*
172* .. Parameters ..
173 INTEGER NTYPES
174 parameter( ntypes = 6 )
175 INTEGER NTESTS
176 parameter( ntests = 3 )
177 REAL ONE, ZERO
178 parameter( one = 1.0e0, zero = 0.0e0 )
179* ..
180* .. Local Scalars ..
181 CHARACTER*3 PATH
182 INTEGER I, IHIGH, ILOW, IM, IMODE, IN, INB, INFO,
183 \$ ISTEP, K, LDA, LW, LWORK, M, MNMIN, MODE, N,
184 \$ NB, NERRS, NFAIL, NRUN, NX
185 REAL EPS
186* ..
187* .. Local Arrays ..
188 INTEGER ISEED( 4 ), ISEEDY( 4 )
189 REAL RESULT( NTESTS )
190* ..
191* .. External Functions ..
192 REAL SLAMCH, SQPT01, SQRT11, SQRT12
193 EXTERNAL slamch, sqpt01, sqrt11, sqrt12
194* ..
195* .. External Subroutines ..
196 EXTERNAL alahd, alasum, icopy, sgeqp3, slacpy, slaord,
198* ..
199* .. Intrinsic Functions ..
200 INTRINSIC max, min
201* ..
202* .. Scalars in Common ..
203 LOGICAL LERR, OK
204 CHARACTER*32 SRNAMT
205 INTEGER INFOT, IOUNIT
206* ..
207* .. Common blocks ..
208 COMMON / infoc / infot, iounit, ok, lerr
209 COMMON / srnamc / srnamt
210* ..
211* .. Data statements ..
212 DATA iseedy / 1988, 1989, 1990, 1991 /
213* ..
214* .. Executable Statements ..
215*
216* Initialize constants and the random number seed.
217*
218 path( 1: 1 ) = 'Single precision'
219 path( 2: 3 ) = 'Q3'
220 nrun = 0
221 nfail = 0
222 nerrs = 0
223 DO 10 i = 1, 4
224 iseed( i ) = iseedy( i )
225 10 CONTINUE
226 eps = slamch( 'Epsilon' )
227 infot = 0
228*
229 DO 90 im = 1, nm
230*
231* Do for each value of M in MVAL.
232*
233 m = mval( im )
234 lda = max( 1, m )
235*
236 DO 80 in = 1, nn
237*
238* Do for each value of N in NVAL.
239*
240 n = nval( in )
241 mnmin = min( m, n )
242 lwork = max( 1, m*max( m, n )+4*mnmin+max( m, n ),
243 \$ m*n + 2*mnmin + 4*n )
244*
245 DO 70 imode = 1, ntypes
246 IF( .NOT.dotype( imode ) )
247 \$ GO TO 70
248*
249* Do for each type of matrix
250* 1: zero matrix
251* 2: one small singular value
252* 3: geometric distribution of singular values
253* 4: first n/2 columns fixed
254* 5: last n/2 columns fixed
255* 6: every second column fixed
256*
257 mode = imode
258 IF( imode.GT.3 )
259 \$ mode = 1
260*
261* Generate test matrix of size m by n using
262* singular value distribution indicated by `mode'.
263*
264 DO 20 i = 1, n
265 iwork( i ) = 0
266 20 CONTINUE
267 IF( imode.EQ.1 ) THEN
268 CALL slaset( 'Full', m, n, zero, zero, copya, lda )
269 DO 30 i = 1, mnmin
270 s( i ) = zero
271 30 CONTINUE
272 ELSE
273 CALL slatms( m, n, 'Uniform', iseed, 'Nonsymm', s,
274 \$ mode, one / eps, one, m, n, 'No packing',
275 \$ copya, lda, work, info )
276 IF( imode.GE.4 ) THEN
277 IF( imode.EQ.4 ) THEN
278 ilow = 1
279 istep = 1
280 ihigh = max( 1, n / 2 )
281 ELSE IF( imode.EQ.5 ) THEN
282 ilow = max( 1, n / 2 )
283 istep = 1
284 ihigh = n
285 ELSE IF( imode.EQ.6 ) THEN
286 ilow = 1
287 istep = 2
288 ihigh = n
289 END IF
290 DO 40 i = ilow, ihigh, istep
291 iwork( i ) = 1
292 40 CONTINUE
293 END IF
294 CALL slaord( 'Decreasing', mnmin, s, 1 )
295 END IF
296*
297 DO 60 inb = 1, nnb
298*
299* Do for each pair of values (NB,NX) in NBVAL and NXVAL.
300*
301 nb = nbval( inb )
302 CALL xlaenv( 1, nb )
303 nx = nxval( inb )
304 CALL xlaenv( 3, nx )
305*
306* Get a working copy of COPYA into A and a copy of
307* vector IWORK.
308*
309 CALL slacpy( 'All', m, n, copya, lda, a, lda )
310 CALL icopy( n, iwork( 1 ), 1, iwork( n+1 ), 1 )
311*
312* Compute the QR factorization with pivoting of A
313*
314 lw = max( 1, 2*n+nb*( n+1 ) )
315*
316* Compute the QP3 factorization of A
317*
318 srnamt = 'SGEQP3'
319 CALL sgeqp3( m, n, a, lda, iwork( n+1 ), tau, work,
320 \$ lw, info )
321*
322* Compute norm(svd(a) - svd(r))
323*
324 result( 1 ) = sqrt12( m, n, a, lda, s, work,
325 \$ lwork )
326*
327* Compute norm( A*P - Q*R )
328*
329 result( 2 ) = sqpt01( m, n, mnmin, copya, a, lda, tau,
330 \$ iwork( n+1 ), work, lwork )
331*
332* Compute Q'*Q
333*
334 result( 3 ) = sqrt11( m, mnmin, a, lda, tau, work,
335 \$ lwork )
336*
337* Print information about the tests that did not pass
338* the threshold.
339*
340 DO 50 k = 1, ntests
341 IF( result( k ).GE.thresh ) THEN
342 IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
343 \$ CALL alahd( nout, path )
344 WRITE( nout, fmt = 9999 )'SGEQP3', m, n, nb,
345 \$ imode, k, result( k )
346 nfail = nfail + 1
347 END IF
348 50 CONTINUE
349 nrun = nrun + ntests
350*
351 60 CONTINUE
352 70 CONTINUE
353 80 CONTINUE
354 90 CONTINUE
355*
356* Print a summary of the results.
357*
358 CALL alasum( path, nout, nfail, nrun, nerrs )
359*
360 9999 FORMAT( 1x, a, ' M =', i5, ', N =', i5, ', NB =', i4, ', type ',
361 \$ i2, ', test ', i2, ', ratio =', g12.5 )
362*
363* End of SCHKQ3
364*
subroutine alasum(type, nout, nfail, nrun, nerrs)
ALASUM
Definition alasum.f:73
subroutine xlaenv(ispec, nvalue)
XLAENV
Definition xlaenv.f:81
subroutine alahd(iounit, path)
ALAHD
Definition alahd.f:107
subroutine sgeqp3(m, n, a, lda, jpvt, tau, work, lwork, info)
SGEQP3
Definition sgeqp3.f:151
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 slamch(cmach)
SLAMCH
Definition slamch.f:68
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 icopy(n, sx, incx, sy, incy)
ICOPY
Definition icopy.f:75
subroutine slaord(job, n, x, incx)
SLAORD
Definition slaord.f:73
subroutine slatms(m, n, dist, iseed, sym, d, mode, cond, dmax, kl, ku, pack, a, lda, work, info)
SLATMS
Definition slatms.f:321
real function sqpt01(m, n, k, a, af, lda, tau, jpvt, work, lwork)
SQPT01
Definition sqpt01.f:121
real function sqrt11(m, k, a, lda, tau, work, lwork)
SQRT11
Definition sqrt11.f:98
real function sqrt12(m, n, a, lda, s, work, lwork)
SQRT12
Definition sqrt12.f:89
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