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