Interpolation and gridding of data are common procedures in the physical sciences, and many approaches have been proposed. In many cases these tasks can be simplified by using Green's functions for splines in tension. The functions presented here are Matlab implementations of the theory presented in the paper referenced below. For efficiency, two core functions that evaluate the Kelvin-functions in the Green's functions (equations 23 and 24) are implemented in C and called as MEX files by the matlab function with the same name. If you have difficulty making the MEX functions work you may simply add the plain Matlab calls for (23) and (24) to the respective Matlab functions.
Last update February 10, 1998 by Paul Wessel