pp interp1 (x,v,method,'pp') returns the piecewise polynomial form of v ( x) using the method algorithm. vq interp1 (v,xq,method,extrapolation) specifies an extrapolation strategy and uses the default sample points. The first is spline: yyspline(x, y, xx) This performs cubic spline interpolation, generally using not-a-knot conditions. I had to write it in German unfortunately (was for school) but the matrix might help you anyway. Piecewise linear interpolation - MATLAB Cody - MATLAB Central Problem 970. vq interp1 (v,xq,method) specifies any of the alternative interpolation methods and uses the default sample points. Piecewise Interpolation in MATLAB MATLAB has several built-in functions to implement piecewise interpolation. The matrix is filled like shown in that document on page 17. I have written a web tool that performs a cubic inteprolation and my approach was to calculate the coefficients by solving a matrix using the gaussian elimination. Usually the equations look like this (for example with the following set of points):
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