LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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◆ dmake()

subroutine dmake ( character*2  TYPE,
character*1  UPLO,
character*1  DIAG,
integer  M,
integer  N,
double precision, dimension( nmax, * )  A,
integer  NMAX,
double precision, dimension( * )  AA,
integer  LDA,
integer  KL,
integer  KU,
logical  RESET,
double precision  TRANSL 
)

Definition at line 2463 of file c_dblat2.f.

2465*
2466* Generates values for an M by N matrix A within the bandwidth
2467* defined by KL and KU.
2468* Stores the values in the array AA in the data structure required
2469* by the routine, with unwanted elements set to rogue value.
2470*
2471* TYPE is 'ge', 'gb', 'sy', 'sb', 'sp', 'tr', 'tb' OR 'tp'.
2472*
2473* Auxiliary routine for test program for Level 2 Blas.
2474*
2475* -- Written on 10-August-1987.
2476* Richard Hanson, Sandia National Labs.
2477* Jeremy Du Croz, NAG Central Office.
2478*
2479* .. Parameters ..
2480 DOUBLE PRECISION ZERO, ONE
2481 parameter( zero = 0.0d0, one = 1.0d0 )
2482 DOUBLE PRECISION ROGUE
2483 parameter( rogue = -1.0d10 )
2484* .. Scalar Arguments ..
2485 DOUBLE PRECISION TRANSL
2486 INTEGER KL, KU, LDA, M, N, NMAX
2487 LOGICAL RESET
2488 CHARACTER*1 DIAG, UPLO
2489 CHARACTER*2 TYPE
2490* .. Array Arguments ..
2491 DOUBLE PRECISION A( NMAX, * ), AA( * )
2492* .. Local Scalars ..
2493 INTEGER I, I1, I2, I3, IBEG, IEND, IOFF, J, KK
2494 LOGICAL GEN, LOWER, SYM, TRI, UNIT, UPPER
2495* .. External Functions ..
2496 DOUBLE PRECISION DBEG
2497 EXTERNAL dbeg
2498* .. Intrinsic Functions ..
2499 INTRINSIC max, min
2500* .. Executable Statements ..
2501 gen = TYPE( 1: 1 ).EQ.'g'
2502 sym = TYPE( 1: 1 ).EQ.'s'
2503 tri = TYPE( 1: 1 ).EQ.'t'
2504 upper = ( sym.OR.tri ).AND.uplo.EQ.'U'
2505 lower = ( sym.OR.tri ).AND.uplo.EQ.'L'
2506 unit = tri.AND.diag.EQ.'U'
2507*
2508* Generate data in array A.
2509*
2510 DO 20 j = 1, n
2511 DO 10 i = 1, m
2512 IF( gen.OR.( upper.AND.i.LE.j ).OR.( lower.AND.i.GE.j ) )
2513 $ THEN
2514 IF( ( i.LE.j.AND.j - i.LE.ku ).OR.
2515 $ ( i.GE.j.AND.i - j.LE.kl ) )THEN
2516 a( i, j ) = dbeg( reset ) + transl
2517 ELSE
2518 a( i, j ) = zero
2519 END IF
2520 IF( i.NE.j )THEN
2521 IF( sym )THEN
2522 a( j, i ) = a( i, j )
2523 ELSE IF( tri )THEN
2524 a( j, i ) = zero
2525 END IF
2526 END IF
2527 END IF
2528 10 CONTINUE
2529 IF( tri )
2530 $ a( j, j ) = a( j, j ) + one
2531 IF( unit )
2532 $ a( j, j ) = one
2533 20 CONTINUE
2534*
2535* Store elements in array AS in data structure required by routine.
2536*
2537 IF( type.EQ.'ge' )THEN
2538 DO 50 j = 1, n
2539 DO 30 i = 1, m
2540 aa( i + ( j - 1 )*lda ) = a( i, j )
2541 30 CONTINUE
2542 DO 40 i = m + 1, lda
2543 aa( i + ( j - 1 )*lda ) = rogue
2544 40 CONTINUE
2545 50 CONTINUE
2546 ELSE IF( type.EQ.'gb' )THEN
2547 DO 90 j = 1, n
2548 DO 60 i1 = 1, ku + 1 - j
2549 aa( i1 + ( j - 1 )*lda ) = rogue
2550 60 CONTINUE
2551 DO 70 i2 = i1, min( kl + ku + 1, ku + 1 + m - j )
2552 aa( i2 + ( j - 1 )*lda ) = a( i2 + j - ku - 1, j )
2553 70 CONTINUE
2554 DO 80 i3 = i2, lda
2555 aa( i3 + ( j - 1 )*lda ) = rogue
2556 80 CONTINUE
2557 90 CONTINUE
2558 ELSE IF( type.EQ.'sy'.OR.type.EQ.'tr' )THEN
2559 DO 130 j = 1, n
2560 IF( upper )THEN
2561 ibeg = 1
2562 IF( unit )THEN
2563 iend = j - 1
2564 ELSE
2565 iend = j
2566 END IF
2567 ELSE
2568 IF( unit )THEN
2569 ibeg = j + 1
2570 ELSE
2571 ibeg = j
2572 END IF
2573 iend = n
2574 END IF
2575 DO 100 i = 1, ibeg - 1
2576 aa( i + ( j - 1 )*lda ) = rogue
2577 100 CONTINUE
2578 DO 110 i = ibeg, iend
2579 aa( i + ( j - 1 )*lda ) = a( i, j )
2580 110 CONTINUE
2581 DO 120 i = iend + 1, lda
2582 aa( i + ( j - 1 )*lda ) = rogue
2583 120 CONTINUE
2584 130 CONTINUE
2585 ELSE IF( type.EQ.'sb'.OR.type.EQ.'tb' )THEN
2586 DO 170 j = 1, n
2587 IF( upper )THEN
2588 kk = kl + 1
2589 ibeg = max( 1, kl + 2 - j )
2590 IF( unit )THEN
2591 iend = kl
2592 ELSE
2593 iend = kl + 1
2594 END IF
2595 ELSE
2596 kk = 1
2597 IF( unit )THEN
2598 ibeg = 2
2599 ELSE
2600 ibeg = 1
2601 END IF
2602 iend = min( kl + 1, 1 + m - j )
2603 END IF
2604 DO 140 i = 1, ibeg - 1
2605 aa( i + ( j - 1 )*lda ) = rogue
2606 140 CONTINUE
2607 DO 150 i = ibeg, iend
2608 aa( i + ( j - 1 )*lda ) = a( i + j - kk, j )
2609 150 CONTINUE
2610 DO 160 i = iend + 1, lda
2611 aa( i + ( j - 1 )*lda ) = rogue
2612 160 CONTINUE
2613 170 CONTINUE
2614 ELSE IF( type.EQ.'sp'.OR.type.EQ.'tp' )THEN
2615 ioff = 0
2616 DO 190 j = 1, n
2617 IF( upper )THEN
2618 ibeg = 1
2619 iend = j
2620 ELSE
2621 ibeg = j
2622 iend = n
2623 END IF
2624 DO 180 i = ibeg, iend
2625 ioff = ioff + 1
2626 aa( ioff ) = a( i, j )
2627 IF( i.EQ.j )THEN
2628 IF( unit )
2629 $ aa( ioff ) = rogue
2630 END IF
2631 180 CONTINUE
2632 190 CONTINUE
2633 END IF
2634 RETURN
2635*
2636* End of DMAKE.
2637*
double precision function dbeg(RESET)
Definition: dblat2.f:3059