I created a small delphi application to solver bicubic spline interpolation problem. I have a grid of 4x4 functions value and I want use bicubic spline interpolation to get value for x, y point.
https://en.wikipedia.org/wiki/Bicubic_interpolation
I need to do some tests. Is there same online solver or free application to compare my results with these? I think Scilab can help me but I cannot understand how use it for bicubic spline interpolation.
Have a look here. In page 125, you will find a piece of code and good explanations.
For more information, have a look here.