GNU Scientific Library – Reference Manual: 2D Introduction to Interpolation

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### 28.9 Introduction to 2D Interpolation

Given a set of x coordinates x_1,...,x_m and a set of y coordinates y_1,...,y_n, each in increasing order, plus a set of function values z_{ij} for each grid point (x_i,y_j), the routines described in this section compute a continuous interpolation function z(x,y) such that z(x_i,y_j) = z_{ij}.