OPAL (Object Oriented Parallel Accelerator Library)  2.2.0
OPAL
interpol.h
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1 /* interpol.h
2  interpolation function definition
3 
4  Project: Beam Envelope Tracker (BET)
5 
6  Revision history
7  Date Description Programmer
8  ------------ -------------------------------------------- --------------
9  09-03-06 Created Rene Bakker
10 */
11 
12 
13 #ifndef _INTERPOL_DEF
14 #define _INTERPOL_DEF
15 
16 /* spline()
17  Given arrays x[0..n-1] and y[0..n-1] containing a tabulated function,
18  i.e., y[i] = f(x[i]), with x[1] < x[2] < .. . < x[N-1], this routine
19  returns an array y2[0..n-1] that contains the second derivatives of the
20  interpolating function at the tabulated points x[i].
21  Derrivate at bounderies set to zero !
22 */
23 void spline
24 (
25  double x[],
26  double y[],
27  int n,
28  double y2[]);
29 
30 /* splint()
31  Given the arrays xa[0..n-1] and ya[0..n-1], which tabulate a function
32  (with the xa[i] in order), and given the array y2a[0..n-1], which
33  is the output from spline above, and given a value of x, this routine
34  returns a cubic-spline interpolated value y.
35 */
36 void splint
37 (
38  double xa[],
39  double ya[],
40  double y2a[],
41  int n,
42  double x,
43  double *y);
44 
45 /* lsplint()
46  Given the arrays xa[0..n-1] and ya[0..n-1], which tabulate a function
47  (with the xa[i] in order), and given the array y2a[0..n-1], which
48  is the output from spline above, and given a value of x, this routine
49  returns a cubic-spline interpolated value y, which is limited between
50  the y-values of the adjacent points.
51 */
52 void lsplint
53 (
54  double xa[],
55  double ya[],
56  double y2a[],
57  int n,
58  double x,
59  double *y);
60 
61 #endif
splint
void splint(double xa[], double ya[], double y2a[], int n, double x, double *y)
Definition: interpol.cpp:95
spline
void spline(double x[], double y[], int n, double y2[])
Definition: interpol.cpp:61
lsplint
void lsplint(double xa[], double ya[], double y2a[], int n, double x, double *y)
Definition: interpol.cpp:137
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