|
Last change
on this file since 5451 was
524,
checked in by lmdzadmin, 21 years ago
|
|
Initial revision
|
-
Property svn:eol-style set to
native
-
Property svn:keywords set to
Author Date Id Revision
|
|
File size:
963 bytes
|
| Line | |
|---|
| 1 | ! |
|---|
| 2 | ! $Header$ |
|---|
| 3 | ! |
|---|
| 4 | |
|---|
| 5 | SUBROUTINE splint(xa,ya,y2a,n,x,y) |
|---|
| 6 | |
|---|
| 7 | c |
|---|
| 8 | c Routine to compute a cubic-spline interpolated value Y given the |
|---|
| 9 | c value of X, the arrays XA, YA and the 2nd derivative array Y2A |
|---|
| 10 | c computed by SUBROUTINE SPLINE. See "Numerical Recipes" for details |
|---|
| 11 | c |
|---|
| 12 | |
|---|
| 13 | IMPLICIT REAL (a-h,o-z) |
|---|
| 14 | IMPLICIT INTEGER (i-n) |
|---|
| 15 | DIMENSION xa(n),ya(n),y2a(n) |
|---|
| 16 | |
|---|
| 17 | kl0=1 |
|---|
| 18 | |
|---|
| 19 | khi=n |
|---|
| 20 | c means of bisection |
|---|
| 21 | 1 IF(khi-kl0.gt.1) THEN |
|---|
| 22 | |
|---|
| 23 | k=(khi+kl0)/2 |
|---|
| 24 | |
|---|
| 25 | IF(xa(k).gt.x) THEN |
|---|
| 26 | |
|---|
| 27 | khi=k |
|---|
| 28 | |
|---|
| 29 | ELSE |
|---|
| 30 | |
|---|
| 31 | kl0=k |
|---|
| 32 | |
|---|
| 33 | END IF |
|---|
| 34 | |
|---|
| 35 | GO TO 1 |
|---|
| 36 | |
|---|
| 37 | END IF |
|---|
| 38 | c KL0 and KHI now bracket the X |
|---|
| 39 | h=xa(khi)-xa(kl0) |
|---|
| 40 | |
|---|
| 41 | IF(h.eq.0.0) STOP |
|---|
| 42 | a=(xa(khi)-x)/h |
|---|
| 43 | c evaluation of cubic spline polynomial |
|---|
| 44 | b=(x-xa(kl0))/h |
|---|
| 45 | |
|---|
| 46 | y=a*ya(kl0)+b*ya(khi)+((a**3-a)*y2a(kl0)+(b**3-b)*y2a(khi))*(h**2) |
|---|
| 47 | |
|---|
| 48 | ./6. |
|---|
| 49 | |
|---|
| 50 | c |
|---|
| 51 | |
|---|
| 52 | RETURN |
|---|
| 53 | |
|---|
| 54 | END |
|---|
| 55 | |
|---|
| 56 | |
|---|
Note: See
TracBrowser
for help on using the repository browser.
