/[MITgcm]/MITgcm/lsopt/dgscale.F
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Revision 1.4 - (show annotations) (download)
Thu Sep 9 15:51:26 2004 UTC (19 years, 5 months ago) by heimbach
Branch: MAIN
CVS Tags: checkpoint62v, checkpoint57m_post, checkpoint62u, checkpoint57g_pre, checkpoint62t, checkpoint57s_post, checkpoint58b_post, checkpoint57b_post, checkpoint57g_post, checkpoint56b_post, checkpoint57y_post, checkpoint65z, checkpoint65x, checkpoint65y, checkpoint65r, checkpoint65s, checkpoint65p, checkpoint65q, checkpoint65v, checkpoint65w, checkpoint65t, checkpoint65u, checkpoint65j, checkpoint65k, checkpoint65h, checkpoint65i, checkpoint65n, checkpoint65l, checkpoint65m, checkpoint65b, checkpoint65c, checkpoint65a, checkpoint65f, checkpoint65g, checkpoint65d, checkpoint65e, checkpoint62c, checkpoint57r_post, checkpoint57d_post, checkpoint57i_post, checkpoint59, checkpoint58, checkpoint55, checkpoint57, checkpoint56, checkpoint58f_post, checkpoint57n_post, checkpoint58d_post, checkpoint62s, checkpoint58a_post, checkpoint62r, checkpoint62q, checkpoint62p, checkpoint57z_post, checkpoint54f_post, checkpoint62a, checkpoint62g, checkpoint62f, checkpoint62e, checkpoint62d, checkpoint62k, checkpoint62j, checkpoint62i, checkpoint62h, checkpoint62o, checkpoint62n, checkpoint62m, checkpoint62l, checkpoint62w, checkpoint62z, checkpoint62y, checkpoint62x, checkpoint58y_post, checkpoint58t_post, checkpoint55i_post, checkpoint58m_post, checkpoint57l_post, checkpoint57t_post, checkpoint55c_post, checkpoint63g, checkpoint57v_post, checkpoint57f_post, checkpoint64, checkpoint65, checkpoint60, checkpoint61, checkpoint62, checkpoint63, checkpoint57a_post, checkpoint57h_pre, checkpoint66g, checkpoint66f, checkpoint66e, checkpoint66d, checkpoint66c, checkpoint66b, checkpoint66a, checkpoint66o, checkpoint66n, checkpoint66m, checkpoint66l, checkpoint66k, checkpoint66j, checkpoint66i, checkpoint66h, checkpoint58w_post, checkpoint57h_post, checkpoint57y_pre, checkpoint55g_post, checkpoint58o_post, checkpoint57c_post, checkpoint58p_post, checkpoint58q_post, checkpoint55d_post, checkpoint58e_post, checkpoint63p, checkpoint63q, checkpoint63r, checkpoint63s, checkpoint63l, checkpoint63m, checkpoint63n, checkpoint63o, checkpoint63h, checkpoint63i, checkpoint63j, checkpoint63k, checkpoint63d, checkpoint63e, checkpoint63f, checkpoint63a, checkpoint63b, checkpoint63c, checkpoint55d_pre, checkpoint57c_pre, checkpoint58r_post, checkpoint55j_post, checkpoint55h_post, checkpoint58n_post, checkpoint57e_post, checkpoint55b_post, checkpoint65o, checkpoint59q, checkpoint59p, checkpoint59r, checkpoint59e, checkpoint59d, checkpoint59g, checkpoint59f, checkpoint59a, checkpoint55f_post, checkpoint59c, checkpoint59b, checkpoint59m, checkpoint59l, checkpoint59o, checkpoint59n, checkpoint59i, checkpoint59h, checkpoint59k, checkpoint57p_post, checkpint57u_post, checkpoint57q_post, eckpoint57e_pre, checkpoint58k_post, checkpoint62b, checkpoint58v_post, checkpoint56a_post, checkpoint64y, checkpoint64x, checkpoint58l_post, checkpoint64z, checkpoint64q, checkpoint64p, checkpoint64s, checkpoint64r, checkpoint64u, checkpoint64t, checkpoint64w, checkpoint64v, checkpoint64i, checkpoint64h, checkpoint64k, checkpoint64j, checkpoint64m, checkpoint64l, checkpoint64o, checkpoint64n, checkpoint64a, checkpoint64c, checkpoint64b, checkpoint64e, checkpoint64d, checkpoint64g, checkpoint64f, checkpoint57h_done, checkpoint57j_post, checkpoint57f_pre, checkpoint61f, checkpoint58g_post, checkpoint58x_post, checkpoint61n, checkpoint59j, checkpoint58h_post, checkpoint56c_post, checkpoint58j_post, checkpoint57a_pre, checkpoint55a_post, checkpoint57o_post, checkpoint61q, checkpoint57k_post, checkpoint57w_post, checkpoint61e, checkpoint58i_post, checkpoint57x_post, checkpoint58c_post, checkpoint58u_post, checkpoint58s_post, checkpoint55e_post, checkpoint61g, checkpoint61d, checkpoint61b, checkpoint61c, checkpoint61a, checkpoint61o, checkpoint61l, checkpoint61m, checkpoint61j, checkpoint61k, checkpoint61h, checkpoint61i, checkpoint61v, checkpoint61w, checkpoint61t, checkpoint61u, checkpoint61r, checkpoint61s, checkpoint61p, checkpoint61z, checkpoint61x, checkpoint61y, HEAD
Changes since 1.3: +1 -1 lines
Small modifs and fixes
(mostly change to real*4 for large-scale ECCO runs)

1
2 subroutine dgscale( nn, gold, xdiff, diag, rmin )
3
4
5 c ==================================================================
6 c SUBROUTINE dgscale
7 c ==================================================================
8 c
9 c o computes new preconditioner and writes it to OPWARMD
10 c
11 c o started: ??? not reproducible
12 c
13 c o Version: 2.1.0, 02-Mar-2000: Patrick Heimbach, MIT/EAPS
14 c
15 c ==================================================================
16 c SUBROUTINE dgscale
17 c ==================================================================
18
19 implicit none
20
21 #include "blas1.h"
22
23 integer nn
24 double precision gold(nn), xdiff(nn), diag(nn)
25
26 integer i
27 double precision r1, rmin, den
28
29
30 c-----------------------------------------
31 c read diagonal
32 c-----------------------------------------
33 call dostore( nn, diag, .false., 3 )
34
35 r1 = 0.
36 do i = 1, nn
37 r1 = r1 + gold(i)*gold(i)*diag(i)
38 end do
39 r1 = 1.0 / r1
40
41 call SSCAL( nn, r1, diag, 1 )
42
43 c-----------------------------------------
44 c update the diagonal
45 c (gg is used as an auxiliary vector)
46 c-----------------------------------------
47
48 den = 0.0
49
50 do i = 1, nn
51 cph(
52 if (diag(i).LE.0) then
53 cph print *, 'pathei-lsopt: in dgscale; diag = 0 for i=', i
54 diag(i) = rmin
55 end if
56 cph)
57 den = den + xdiff(i)*xdiff(i) / diag(i)
58 end do
59
60 do i = 1, nn
61 diag(i) = 1./
62 $ (1./diag(i)+gold(i)**2-(xdiff(i)/diag(i))**2/den)
63 if (diag(i).le.0.) then
64 diag(i) = rmin
65 endif
66 end do
67
68 c-----------------------------------------
69 c write diagonal
70 c-----------------------------------------
71 call dostore( nn, diag, .true., 3 )
72
73 return
74 end

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