HyPar  1.0
Finite-Difference Hyperbolic-Parabolic PDE Solver on Cartesian Grids
TrilinearInterpolation.c
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1 
6 #include <mathfunctions.h>
7 
22 void TrilinearInterpCoeffs(
23  double xmin,
24  double xmax,
25  double ymin,
26  double ymax,
27  double zmin,
28  double zmax,
29  double x,
30  double y,
31  double z,
32  double *coeffs
33  )
34 {
35  double vol_inv = 1 / ((xmax-xmin)*(ymax-ymin)*(zmax-zmin));
36  double tldx1 = x - xmin;
37  double tldx2 = xmax - x;
38  double tldy1 = y - ymin;
39  double tldy2 = ymax - y;
40  double tldz1 = z - zmin;
41  double tldz2 = zmax - z;
42 
43  coeffs[0] = tldz2 * tldy2 * tldx2 * vol_inv;
44  coeffs[1] = tldz2 * tldy2 * tldx1 * vol_inv;
45  coeffs[2] = tldz2 * tldy1 * tldx2 * vol_inv;
46  coeffs[3] = tldz2 * tldy1 * tldx1 * vol_inv;
47  coeffs[4] = tldz1 * tldy2 * tldx2 * vol_inv;
48  coeffs[5] = tldz1 * tldy2 * tldx1 * vol_inv;
49  coeffs[6] = tldz1 * tldy1 * tldx2 * vol_inv;
50  coeffs[7] = tldz1 * tldy1 * tldx1 * vol_inv;
51 
52  return;
53 }
mathfunctions.h
Contains function definitions for common mathematical functions.
TrilinearInterpCoeffs
void TrilinearInterpCoeffs(double xmin, double xmax, double ymin, double ymax, double zmin, double zmax, double x, double y, double z, double *coeffs)
Definition: TrilinearInterpolation.c:22