/[lmdze]/trunk/Sources/dyn3d/PPM3d/filcr.f
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Annotation of /trunk/Sources/dyn3d/PPM3d/filcr.f

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Revision 166 - (hide annotations)
Wed Jul 29 14:32:55 2015 UTC (8 years, 10 months ago) by guez
File size: 2295 byte(s) 
Split ppm3d.f into files containing a single procedure.

Factorized computations of filtering matrices into a procedure
inifilr_hemisph. Had then to change the matrices from allocatable to
pointer and from customized lower bound to lower bound 1. The change
in lower bounds does not matter because the matrices are only used as
a whole as actual arguments.

Also, in infilr, instead of finding jfilt[ns][uv] from approximately
jjm /2, start at index j1 that corresponds to the equator. This is not
the same if there is a zoom in latitude.

Also, the test (rlamda(modfrst[ns][uv](j)) * cos(rlat[uv](j)) < 1) in
the loops on filtered latitudes is not useful now that we start from
j1: it is necessarily true. See notes.

Just encapsulated lwvn into a module and removed unused argument ktraer.
1 guez 166 SUBROUTINE filcr(q, imr, jnp, j1, j2, cosp, acosp, icr, tiny)
2     DIMENSION q(imr, *), cosp(*), acosp(*)
3    
4     icr = 0
5     DO j = j1 + 1, j2 - 1
6     DO i = 1, imr - 1
7     IF (q(i,j)<0.) THEN
8     icr = 1
9     dq = -q(i, j)*cosp(j)
10     ! N-E
11     dn = q(i+1, j+1)*cosp(j+1)
12     d0 = max(0., dn)
13     d1 = min(dq, d0)
14     q(i+1, j+1) = (dn-d1)*acosp(j+1)
15     dq = dq - d1
16     ! S-E
17     ds = q(i+1, j-1)*cosp(j-1)
18     d0 = max(0., ds)
19     d2 = min(dq, d0)
20     q(i+1, j-1) = (ds-d2)*acosp(j-1)
21     q(i, j) = (d2-dq)*acosp(j) + tiny
22     END IF
23     END DO
24     IF (icr==0 .AND. q(imr,j)>=0.) GO TO 65
25     DO i = 2, imr
26     IF (q(i,j)<0.) THEN
27     icr = 1
28     dq = -q(i, j)*cosp(j)
29     ! N-W
30     dn = q(i-1, j+1)*cosp(j+1)
31     d0 = max(0., dn)
32     d1 = min(dq, d0)
33     q(i-1, j+1) = (dn-d1)*acosp(j+1)
34     dq = dq - d1
35     ! S-W
36     ds = q(i-1, j-1)*cosp(j-1)
37     d0 = max(0., ds)
38     d2 = min(dq, d0)
39     q(i-1, j-1) = (ds-d2)*acosp(j-1)
40     q(i, j) = (d2-dq)*acosp(j) + tiny
41     END IF
42     END DO
43     ! *****************************************
44     ! i=1
45     i = 1
46     IF (q(i,j)<0.) THEN
47     icr = 1
48     dq = -q(i, j)*cosp(j)
49     ! N-W
50     dn = q(imr, j+1)*cosp(j+1)
51     d0 = max(0., dn)
52     d1 = min(dq, d0)
53     q(imr, j+1) = (dn-d1)*acosp(j+1)
54     dq = dq - d1
55     ! S-W
56     ds = q(imr, j-1)*cosp(j-1)
57     d0 = max(0., ds)
58     d2 = min(dq, d0)
59     q(imr, j-1) = (ds-d2)*acosp(j-1)
60     q(i, j) = (d2-dq)*acosp(j) + tiny
61     END IF
62     ! *****************************************
63     ! i=IMR
64     i = imr
65     IF (q(i,j)<0.) THEN
66     icr = 1
67     dq = -q(i, j)*cosp(j)
68     ! N-E
69     dn = q(1, j+1)*cosp(j+1)
70     d0 = max(0., dn)
71     d1 = min(dq, d0)
72     q(1, j+1) = (dn-d1)*acosp(j+1)
73     dq = dq - d1
74     ! S-E
75     ds = q(1, j-1)*cosp(j-1)
76     d0 = max(0., ds)
77     d2 = min(dq, d0)
78     q(1, j-1) = (ds-d2)*acosp(j-1)
79     q(i, j) = (d2-dq)*acosp(j) + tiny
80     END IF
81     ! *****************************************
82     65 END DO
83    
84     DO i = 1, imr
85     IF (q(i,j1)<0. .OR. q(i,j2)<0.) THEN
86     icr = 1
87     GO TO 80
88     END IF
89     END DO
90    
91     80 CONTINUE
92    
93     IF (q(1,1)<0. .OR. q(1,jnp)<0.) THEN
94     icr = 1
95     END IF
96    
97     RETURN
98     END SUBROUTINE filcr
99    
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