|
Last change
on this file since 461 was
38,
checked in by emillour, 14 years ago
|
|
Ajout du modè Martien (mon LMDZ.MARS.BETA, du 28/01/2011) dans le rértoire mars, pour pouvoir suivre plus facilement les modifs.
EM
|
|
File size:
907 bytes
|
| Line | |
|---|
| 1 | SUBROUTINE DTRIDGL(L,AF,BF,CF,DF,XK) |
|---|
| 2 | |
|---|
| 3 | C GCM2.0 Feb 2003 |
|---|
| 4 | |
|---|
| 5 | C DOUBLE PRECISION VERSION OF TRIDGL |
|---|
| 6 | |
|---|
| 7 | PARAMETER (NMAX=201) |
|---|
| 8 | IMPLICIT REAL*8 (A-H,O-Z) |
|---|
| 9 | DIMENSION AF(L),BF(L),CF(L),DF(L),XK(L) |
|---|
| 10 | DIMENSION AS(NMAX),DS(NMAX) |
|---|
| 11 | |
|---|
| 12 | C* THIS SUBROUTINE SOLVES A SYSTEM OF TRIDIAGIONAL MATRIX |
|---|
| 13 | C* EQUATIONS. THE FORM OF THE EQUATIONS ARE: |
|---|
| 14 | C* A(I)*X(I-1) + B(I)*X(I) + C(I)*X(I+1) = D(I) |
|---|
| 15 | C* WHERE I=1,L LESS THAN 103. |
|---|
| 16 | C* ..............REVIEWED -CP........ |
|---|
| 17 | |
|---|
| 18 | C======================================================================C |
|---|
| 19 | |
|---|
| 20 | AS(L) = AF(L)/BF(L) |
|---|
| 21 | DS(L) = DF(L)/BF(L) |
|---|
| 22 | |
|---|
| 23 | DO I=2,L |
|---|
| 24 | X = 1./(BF(L+1-I) - CF(L+1-I)*AS(L+2-I)) |
|---|
| 25 | AS(L+1-I) = AF(L+1-I)*X |
|---|
| 26 | DS(L+1-I) = (DF(L+1-I)-CF(L+1-I)*DS(L+2-I))*X |
|---|
| 27 | END DO |
|---|
| 28 | |
|---|
| 29 | XK(1)=DS(1) |
|---|
| 30 | DO I=2,L |
|---|
| 31 | XKB = XK(I-1) |
|---|
| 32 | XK(I) = DS(I)-AS(I)*XKB |
|---|
| 33 | END DO |
|---|
| 34 | |
|---|
| 35 | RETURN |
|---|
| 36 | END |
|---|
Note: See
TracBrowser
for help on using the repository browser.
