Here's my problem, I have an spreadsheet that contains data, a 202x202 matrix with x,y and z coordinates. The objective is import the data to mathematica, and then I need to create an interpolation function (cubic) from scratch to interpolate the entire surface. My problem is to create the entire spline function starting from scratch, and then map it across the surface. If anyone as a clue, I'll be happy to hear it !
PS : the points of the surface are experimental values