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