Einspline is intended to be a simple, fast, and accurate library for creating and evaluating interpolating cubic basis splines (b-splines).

it features the following:
- grids of one, two or three dimensions
- both uniform and non-uniform grids
- real and complex datatypes in single or double precision
- evaluation of value, gradient, hessian and laplacian
- periodic, fixed first-derivative, or fixed second derivative boundary
conditions
- c and fortran 77 interfaces
this package contains a static version of the library and its documentation.