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math/
biharmonic_interp.pro
top source biharmonic_interp
Math
result = biharmonic_interp(z, x, y, xout, yout)
Performs biharmonic interpolation for a function defined on a 2D grid.
Biharmonic interplation of Z(X,Y) is equivalent to bilinear interpolation on the grid Z( log(X), log(Y) ), which is in fact how it is calculated.
Return value
A vector containing the value of the function biharmonically interpreted at each Xout,Yout pair. The output will have the same number of elements as Xout and Yout.
Parameters
- z in
2D array containing the values of the function defined at each X,Y grid point. The first dimension of Z must have the same length as X and the second dimension must have the same length as Y.
- x in
Vector containing the x-locations of the grid points at which the function is defined.
- y in
Vector containing the y-locations of the grid points at which the function is defined.
- xout in
A vector of x-locations at which the function is to be interpolated.
- yout in
A vector of y-locations at which the function is to be interpolated.
Examples
IDL> xgrid = [1.,2.]
IDL> ygrid = [2.,5.]
IDL> zvals = [ [10.,2.], [25.,15.] ]
IDL> PRINT, BIHARMONIC_INTERP(zvals, xgrid, ygrid, [1.3], [3.])
13.2745
Author information
- History:
Written by: Jeremy Bailin 11 June 2008 Public release in JBIU
File attributes
| Modification date: | Wed Apr 15 16:07:52 2009 |
| Lines: | 91 |