# A bicubic spline interpolation of unequally spaced data

## Description

Title of program: BISPLN Catalogue Id: ACZG_v1_0 Nature of problem A theorist may wish to interpolate data known to be a function of two variables. Often the data are not known on a regular grid, but are distributed irregularly. The 'best approximation' when interpolating data which can be assumed to be error free is with the bicubic spline method. Method of solution: We use de Boor's method and one dimensional cubic spline interpolation to calculate the coefficients of the spline in the rectangle [xi,xi+1] X [yj,yj+1]. We can then obtain an interpolated value ... Versions of this program held in the CPC repository in Mendeley Data ACZG_v1_0; BISPLN; 10.1016/0010-4655(79)90098-5 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)