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slatm5.f
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1*> \brief \b SLATM5
2*
3* =========== DOCUMENTATION ===========
4*
5* Online html documentation available at
6* http://www.netlib.org/lapack/explore-html/
7*
8* Definition:
9* ===========
10*
11* SUBROUTINE SLATM5( PRTYPE, M, N, A, LDA, B, LDB, C, LDC, D, LDD,
12* E, LDE, F, LDF, R, LDR, L, LDL, ALPHA, QBLCKA,
13* QBLCKB )
14*
15* .. Scalar Arguments ..
16* INTEGER LDA, LDB, LDC, LDD, LDE, LDF, LDL, LDR, M, N,
17* $ PRTYPE, QBLCKA, QBLCKB
18* REAL ALPHA
19* ..
20* .. Array Arguments ..
21* REAL A( LDA, * ), B( LDB, * ), C( LDC, * ),
22* $ D( LDD, * ), E( LDE, * ), F( LDF, * ),
23* $ L( LDL, * ), R( LDR, * )
24* ..
25*
26*
27*> \par Purpose:
28* =============
29*>
30*> \verbatim
31*>
32*> SLATM5 generates matrices involved in the Generalized Sylvester
33*> equation:
34*>
35*> A * R - L * B = C
36*> D * R - L * E = F
37*>
38*> They also satisfy (the diagonalization condition)
39*>
40*> [ I -L ] ( [ A -C ], [ D -F ] ) [ I R ] = ( [ A ], [ D ] )
41*> [ I ] ( [ B ] [ E ] ) [ I ] ( [ B ] [ E ] )
42*>
43*> \endverbatim
44*
45* Arguments:
46* ==========
47*
48*> \param[in] PRTYPE
49*> \verbatim
50*> PRTYPE is INTEGER
51*> "Points" to a certain type of the matrices to generate
52*> (see further details).
53*> \endverbatim
54*>
55*> \param[in] M
56*> \verbatim
57*> M is INTEGER
58*> Specifies the order of A and D and the number of rows in
59*> C, F, R and L.
60*> \endverbatim
61*>
62*> \param[in] N
63*> \verbatim
64*> N is INTEGER
65*> Specifies the order of B and E and the number of columns in
66*> C, F, R and L.
67*> \endverbatim
68*>
69*> \param[out] A
70*> \verbatim
71*> A is REAL array, dimension (LDA, M).
72*> On exit A M-by-M is initialized according to PRTYPE.
73*> \endverbatim
74*>
75*> \param[in] LDA
76*> \verbatim
77*> LDA is INTEGER
78*> The leading dimension of A.
79*> \endverbatim
80*>
81*> \param[out] B
82*> \verbatim
83*> B is REAL array, dimension (LDB, N).
84*> On exit B N-by-N is initialized according to PRTYPE.
85*> \endverbatim
86*>
87*> \param[in] LDB
88*> \verbatim
89*> LDB is INTEGER
90*> The leading dimension of B.
91*> \endverbatim
92*>
93*> \param[out] C
94*> \verbatim
95*> C is REAL array, dimension (LDC, N).
96*> On exit C M-by-N is initialized according to PRTYPE.
97*> \endverbatim
98*>
99*> \param[in] LDC
100*> \verbatim
101*> LDC is INTEGER
102*> The leading dimension of C.
103*> \endverbatim
104*>
105*> \param[out] D
106*> \verbatim
107*> D is REAL array, dimension (LDD, M).
108*> On exit D M-by-M is initialized according to PRTYPE.
109*> \endverbatim
110*>
111*> \param[in] LDD
112*> \verbatim
113*> LDD is INTEGER
114*> The leading dimension of D.
115*> \endverbatim
116*>
117*> \param[out] E
118*> \verbatim
119*> E is REAL array, dimension (LDE, N).
120*> On exit E N-by-N is initialized according to PRTYPE.
121*> \endverbatim
122*>
123*> \param[in] LDE
124*> \verbatim
125*> LDE is INTEGER
126*> The leading dimension of E.
127*> \endverbatim
128*>
129*> \param[out] F
130*> \verbatim
131*> F is REAL array, dimension (LDF, N).
132*> On exit F M-by-N is initialized according to PRTYPE.
133*> \endverbatim
134*>
135*> \param[in] LDF
136*> \verbatim
137*> LDF is INTEGER
138*> The leading dimension of F.
139*> \endverbatim
140*>
141*> \param[out] R
142*> \verbatim
143*> R is REAL array, dimension (LDR, N).
144*> On exit R M-by-N is initialized according to PRTYPE.
145*> \endverbatim
146*>
147*> \param[in] LDR
148*> \verbatim
149*> LDR is INTEGER
150*> The leading dimension of R.
151*> \endverbatim
152*>
153*> \param[out] L
154*> \verbatim
155*> L is REAL array, dimension (LDL, N).
156*> On exit L M-by-N is initialized according to PRTYPE.
157*> \endverbatim
158*>
159*> \param[in] LDL
160*> \verbatim
161*> LDL is INTEGER
162*> The leading dimension of L.
163*> \endverbatim
164*>
165*> \param[in] ALPHA
166*> \verbatim
167*> ALPHA is REAL
168*> Parameter used in generating PRTYPE = 1 and 5 matrices.
169*> \endverbatim
170*>
171*> \param[in] QBLCKA
172*> \verbatim
173*> QBLCKA is INTEGER
174*> When PRTYPE = 3, specifies the distance between 2-by-2
175*> blocks on the diagonal in A. Otherwise, QBLCKA is not
176*> referenced. QBLCKA > 1.
177*> \endverbatim
178*>
179*> \param[in] QBLCKB
180*> \verbatim
181*> QBLCKB is INTEGER
182*> When PRTYPE = 3, specifies the distance between 2-by-2
183*> blocks on the diagonal in B. Otherwise, QBLCKB is not
184*> referenced. QBLCKB > 1.
185*> \endverbatim
186*
187* Authors:
188* ========
189*
190*> \author Univ. of Tennessee
191*> \author Univ. of California Berkeley
192*> \author Univ. of Colorado Denver
193*> \author NAG Ltd.
194*
195*> \ingroup real_matgen
196*
197*> \par Further Details:
198* =====================
199*>
200*> \verbatim
201*>
202*> PRTYPE = 1: A and B are Jordan blocks, D and E are identity matrices
203*>
204*> A : if (i == j) then A(i, j) = 1.0
205*> if (j == i + 1) then A(i, j) = -1.0
206*> else A(i, j) = 0.0, i, j = 1...M
207*>
208*> B : if (i == j) then B(i, j) = 1.0 - ALPHA
209*> if (j == i + 1) then B(i, j) = 1.0
210*> else B(i, j) = 0.0, i, j = 1...N
211*>
212*> D : if (i == j) then D(i, j) = 1.0
213*> else D(i, j) = 0.0, i, j = 1...M
214*>
215*> E : if (i == j) then E(i, j) = 1.0
216*> else E(i, j) = 0.0, i, j = 1...N
217*>
218*> L = R are chosen from [-10...10],
219*> which specifies the right hand sides (C, F).
220*>
221*> PRTYPE = 2 or 3: Triangular and/or quasi- triangular.
222*>
223*> A : if (i <= j) then A(i, j) = [-1...1]
224*> else A(i, j) = 0.0, i, j = 1...M
225*>
226*> if (PRTYPE = 3) then
227*> A(k + 1, k + 1) = A(k, k)
228*> A(k + 1, k) = [-1...1]
229*> sign(A(k, k + 1) = -(sin(A(k + 1, k))
230*> k = 1, M - 1, QBLCKA
231*>
232*> B : if (i <= j) then B(i, j) = [-1...1]
233*> else B(i, j) = 0.0, i, j = 1...N
234*>
235*> if (PRTYPE = 3) then
236*> B(k + 1, k + 1) = B(k, k)
237*> B(k + 1, k) = [-1...1]
238*> sign(B(k, k + 1) = -(sign(B(k + 1, k))
239*> k = 1, N - 1, QBLCKB
240*>
241*> D : if (i <= j) then D(i, j) = [-1...1].
242*> else D(i, j) = 0.0, i, j = 1...M
243*>
244*>
245*> E : if (i <= j) then D(i, j) = [-1...1]
246*> else E(i, j) = 0.0, i, j = 1...N
247*>
248*> L, R are chosen from [-10...10],
249*> which specifies the right hand sides (C, F).
250*>
251*> PRTYPE = 4 Full
252*> A(i, j) = [-10...10]
253*> D(i, j) = [-1...1] i,j = 1...M
254*> B(i, j) = [-10...10]
255*> E(i, j) = [-1...1] i,j = 1...N
256*> R(i, j) = [-10...10]
257*> L(i, j) = [-1...1] i = 1..M ,j = 1...N
258*>
259*> L, R specifies the right hand sides (C, F).
260*>
261*> PRTYPE = 5 special case common and/or close eigs.
262*> \endverbatim
263*>
264* =====================================================================
265 SUBROUTINE slatm5( PRTYPE, M, N, A, LDA, B, LDB, C, LDC, D, LDD,
266 $ E, LDE, F, LDF, R, LDR, L, LDL, ALPHA, QBLCKA,
267 $ QBLCKB )
268*
269* -- LAPACK computational routine --
270* -- LAPACK is a software package provided by Univ. of Tennessee, --
271* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
272*
273* .. Scalar Arguments ..
274 INTEGER LDA, LDB, LDC, LDD, LDE, LDF, LDL, LDR, M, N,
275 $ PRTYPE, QBLCKA, QBLCKB
276 REAL ALPHA
277* ..
278* .. Array Arguments ..
279 REAL A( LDA, * ), B( LDB, * ), C( LDC, * ),
280 $ D( LDD, * ), E( LDE, * ), F( LDF, * ),
281 $ l( ldl, * ), r( ldr, * )
282* ..
283*
284* =====================================================================
285*
286* .. Parameters ..
287 REAL ONE, ZERO, TWENTY, HALF, TWO
288 PARAMETER ( ONE = 1.0e+0, zero = 0.0e+0, twenty = 2.0e+1,
289 $ half = 0.5e+0, two = 2.0e+0 )
290* ..
291* .. Local Scalars ..
292 INTEGER I, J, K
293 REAL IMEPS, REEPS
294* ..
295* .. Intrinsic Functions ..
296 INTRINSIC mod, real, sin
297* ..
298* .. External Subroutines ..
299 EXTERNAL sgemm
300* ..
301* .. Executable Statements ..
302*
303 IF( prtype.EQ.1 ) THEN
304 DO 20 i = 1, m
305 DO 10 j = 1, m
306 IF( i.EQ.j ) THEN
307 a( i, j ) = one
308 d( i, j ) = one
309 ELSE IF( i.EQ.j-1 ) THEN
310 a( i, j ) = -one
311 d( i, j ) = zero
312 ELSE
313 a( i, j ) = zero
314 d( i, j ) = zero
315 END IF
316 10 CONTINUE
317 20 CONTINUE
318*
319 DO 40 i = 1, n
320 DO 30 j = 1, n
321 IF( i.EQ.j ) THEN
322 b( i, j ) = one - alpha
323 e( i, j ) = one
324 ELSE IF( i.EQ.j-1 ) THEN
325 b( i, j ) = one
326 e( i, j ) = zero
327 ELSE
328 b( i, j ) = zero
329 e( i, j ) = zero
330 END IF
331 30 CONTINUE
332 40 CONTINUE
333*
334 DO 60 i = 1, m
335 DO 50 j = 1, n
336 r( i, j ) = ( half-sin( real( i / j ) ) )*twenty
337 l( i, j ) = r( i, j )
338 50 CONTINUE
339 60 CONTINUE
340*
341 ELSE IF( prtype.EQ.2 .OR. prtype.EQ.3 ) THEN
342 DO 80 i = 1, m
343 DO 70 j = 1, m
344 IF( i.LE.j ) THEN
345 a( i, j ) = ( half-sin( real( i ) ) )*two
346 d( i, j ) = ( half-sin( real( i*j ) ) )*two
347 ELSE
348 a( i, j ) = zero
349 d( i, j ) = zero
350 END IF
351 70 CONTINUE
352 80 CONTINUE
353*
354 DO 100 i = 1, n
355 DO 90 j = 1, n
356 IF( i.LE.j ) THEN
357 b( i, j ) = ( half-sin( real( i+j ) ) )*two
358 e( i, j ) = ( half-sin( real( j ) ) )*two
359 ELSE
360 b( i, j ) = zero
361 e( i, j ) = zero
362 END IF
363 90 CONTINUE
364 100 CONTINUE
365*
366 DO 120 i = 1, m
367 DO 110 j = 1, n
368 r( i, j ) = ( half-sin( real( i*j ) ) )*twenty
369 l( i, j ) = ( half-sin( real( i+j ) ) )*twenty
370 110 CONTINUE
371 120 CONTINUE
372*
373 IF( prtype.EQ.3 ) THEN
374 IF( qblcka.LE.1 )
375 $ qblcka = 2
376 DO 130 k = 1, m - 1, qblcka
377 a( k+1, k+1 ) = a( k, k )
378 a( k+1, k ) = -sin( a( k, k+1 ) )
379 130 CONTINUE
380*
381 IF( qblckb.LE.1 )
382 $ qblckb = 2
383 DO 140 k = 1, n - 1, qblckb
384 b( k+1, k+1 ) = b( k, k )
385 b( k+1, k ) = -sin( b( k, k+1 ) )
386 140 CONTINUE
387 END IF
388*
389 ELSE IF( prtype.EQ.4 ) THEN
390 DO 160 i = 1, m
391 DO 150 j = 1, m
392 a( i, j ) = ( half-sin( real( i*j ) ) )*twenty
393 d( i, j ) = ( half-sin( real( i+j ) ) )*two
394 150 CONTINUE
395 160 CONTINUE
396*
397 DO 180 i = 1, n
398 DO 170 j = 1, n
399 b( i, j ) = ( half-sin( real( i+j ) ) )*twenty
400 e( i, j ) = ( half-sin( real( i*j ) ) )*two
401 170 CONTINUE
402 180 CONTINUE
403*
404 DO 200 i = 1, m
405 DO 190 j = 1, n
406 r( i, j ) = ( half-sin( real( j / i ) ) )*twenty
407 l( i, j ) = ( half-sin( real( i*j ) ) )*two
408 190 CONTINUE
409 200 CONTINUE
410*
411 ELSE IF( prtype.GE.5 ) THEN
412 reeps = half*two*twenty / alpha
413 imeps = ( half-two ) / alpha
414 DO 220 i = 1, m
415 DO 210 j = 1, n
416 r( i, j ) = ( half-sin( real( i*j ) ) )*alpha / twenty
417 l( i, j ) = ( half-sin( real( i+j ) ) )*alpha / twenty
418 210 CONTINUE
419 220 CONTINUE
420*
421 DO 230 i = 1, m
422 d( i, i ) = one
423 230 CONTINUE
424*
425 DO 240 i = 1, m
426 IF( i.LE.4 ) THEN
427 a( i, i ) = one
428 IF( i.GT.2 )
429 $ a( i, i ) = one + reeps
430 IF( mod( i, 2 ).NE.0 .AND. i.LT.m ) THEN
431 a( i, i+1 ) = imeps
432 ELSE IF( i.GT.1 ) THEN
433 a( i, i-1 ) = -imeps
434 END IF
435 ELSE IF( i.LE.8 ) THEN
436 IF( i.LE.6 ) THEN
437 a( i, i ) = reeps
438 ELSE
439 a( i, i ) = -reeps
440 END IF
441 IF( mod( i, 2 ).NE.0 .AND. i.LT.m ) THEN
442 a( i, i+1 ) = one
443 ELSE IF( i.GT.1 ) THEN
444 a( i, i-1 ) = -one
445 END IF
446 ELSE
447 a( i, i ) = one
448 IF( mod( i, 2 ).NE.0 .AND. i.LT.m ) THEN
449 a( i, i+1 ) = imeps*2
450 ELSE IF( i.GT.1 ) THEN
451 a( i, i-1 ) = -imeps*2
452 END IF
453 END IF
454 240 CONTINUE
455*
456 DO 250 i = 1, n
457 e( i, i ) = one
458 IF( i.LE.4 ) THEN
459 b( i, i ) = -one
460 IF( i.GT.2 )
461 $ b( i, i ) = one - reeps
462 IF( mod( i, 2 ).NE.0 .AND. i.LT.n ) THEN
463 b( i, i+1 ) = imeps
464 ELSE IF( i.GT.1 ) THEN
465 b( i, i-1 ) = -imeps
466 END IF
467 ELSE IF( i.LE.8 ) THEN
468 IF( i.LE.6 ) THEN
469 b( i, i ) = reeps
470 ELSE
471 b( i, i ) = -reeps
472 END IF
473 IF( mod( i, 2 ).NE.0 .AND. i.LT.n ) THEN
474 b( i, i+1 ) = one + imeps
475 ELSE IF( i.GT.1 ) THEN
476 b( i, i-1 ) = -one - imeps
477 END IF
478 ELSE
479 b( i, i ) = one - reeps
480 IF( mod( i, 2 ).NE.0 .AND. i.LT.n ) THEN
481 b( i, i+1 ) = imeps*2
482 ELSE IF( i.GT.1 ) THEN
483 b( i, i-1 ) = -imeps*2
484 END IF
485 END IF
486 250 CONTINUE
487 END IF
488*
489* Compute rhs (C, F)
490*
491 CALL sgemm( 'N', 'N', m, n, m, one, a, lda, r, ldr, zero, c, ldc )
492 CALL sgemm( 'N', 'N', m, n, n, -one, l, ldl, b, ldb, one, c, ldc )
493 CALL sgemm( 'N', 'N', m, n, m, one, d, ldd, r, ldr, zero, f, ldf )
494 CALL sgemm( 'N', 'N', m, n, n, -one, l, ldl, e, lde, one, f, ldf )
495*
496* End of SLATM5
497*
498 END
slatm5
subroutine slatm5(prtype, m, n, a, lda, b, ldb, c, ldc, d, ldd, e, lde, f, ldf, r, ldr, l, ldl, alpha, qblcka, qblckb)
SLATM5
Definition slatm5.f:268
sgemm
subroutine sgemm(transa, transb, m, n, k, alpha, a, lda, b, ldb, beta, c, ldc)
SGEMM
Definition sgemm.f:187