1 |
guez |
113 |
module inifgn_m |
2 |
guez |
3 |
|
3 |
guez |
140 |
use dimens_m, only: iim |
4 |
|
|
|
5 |
guez |
113 |
IMPLICIT NONE |
6 |
guez |
3 |
|
7 |
guez |
140 |
private iim |
8 |
|
|
|
9 |
guez |
151 |
real sddu(iim), sddv(iim) ! SQRT(dx / di) |
10 |
guez |
140 |
real unsddu(iim), unsddv(iim) |
11 |
|
|
|
12 |
|
|
real eignfnu(iim, iim), eignfnv(iim, iim) |
13 |
guez |
143 |
! eigenfunctions of the discrete laplacian |
14 |
guez |
140 |
|
15 |
guez |
113 |
contains |
16 |
guez |
3 |
|
17 |
guez |
113 |
SUBROUTINE inifgn(dv) |
18 |
guez |
3 |
|
19 |
guez |
113 |
! From LMDZ4/libf/filtrez/inifgn.F, v 1.1.1.1 2004/05/19 12:53:09 |
20 |
guez |
3 |
|
21 |
guez |
143 |
! H. Upadyaya, O. Sharma |
22 |
guez |
3 |
|
23 |
guez |
143 |
use acc_m, only: acc |
24 |
guez |
113 |
USE dimens_m, ONLY: iim |
25 |
guez |
139 |
USE dynetat0_m, ONLY: xprimu, xprimv |
26 |
guez |
143 |
use numer_rec_95, only: jacobi, eigsrt |
27 |
guez |
3 |
|
28 |
guez |
151 |
real, intent(out):: dv(:) ! (iim) eigenvalues sorted in descending order |
29 |
guez |
81 |
|
30 |
guez |
113 |
! Local: |
31 |
guez |
152 |
REAL, dimension(iim, iim):: a, b, c |
32 |
guez |
113 |
REAL du(iim) |
33 |
guez |
152 |
INTEGER i |
34 |
guez |
81 |
|
35 |
guez |
113 |
!---------------------------------------------------------------- |
36 |
guez |
81 |
|
37 |
guez |
151 |
print *, "Call sequence information: inifgn" |
38 |
|
|
|
39 |
guez |
140 |
sddv = sqrt(xprimv(:iim)) |
40 |
|
|
sddu = sqrt(xprimu(:iim)) |
41 |
|
|
unsddu = 1. / sddu |
42 |
|
|
unsddv = 1. / sddv |
43 |
guez |
81 |
|
44 |
guez |
152 |
b = 0. |
45 |
|
|
b(iim, 1) = 1. / (sddu(iim) * sddv(1)) |
46 |
|
|
forall (i = 1:iim) b(i, i) = - 1./ (sddu(i) * sddv(i)) |
47 |
|
|
forall (i = 1:iim - 1) b(i, i + 1) = 1. / (sddu(i) * sddv(i + 1)) |
48 |
guez |
81 |
|
49 |
guez |
152 |
c = - transpose(b) |
50 |
guez |
140 |
|
51 |
guez |
152 |
a = matmul(c, b) |
52 |
|
|
CALL jacobi(a, dv, eignfnv) |
53 |
guez |
143 |
CALL acc(eignfnv) |
54 |
|
|
CALL eigsrt(dv, eignfnv) |
55 |
guez |
81 |
|
56 |
guez |
152 |
a = matmul(b, c) |
57 |
|
|
CALL jacobi(a, du, eignfnu) |
58 |
guez |
143 |
CALL acc(eignfnu) |
59 |
|
|
CALL eigsrt(du, eignfnu) |
60 |
guez |
81 |
|
61 |
guez |
113 |
END SUBROUTINE inifgn |
62 |
guez |
81 |
|
63 |
guez |
113 |
end module inifgn_m |