MATLAB code for differentiation of RBF approximations both using the direct method and using the stable RBF-QR method.
If you use the code, please cite the following paper:
E. Larsson, A. Heryudono, A. Michael, and C. Piret, A Matlab code for stable differentiation of radial basis function approximations, J. Approx. Softw., 3 (2026), pp. 56-76. https://doi.org/10.13135/3103-1935/12293
and relevant references therein if appropriate.