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Author Date Id Revision
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File size:
963 bytes
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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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