Department of Mathematics
This work focuses on the invertibility of non-constant shape Gaussian asymmetric interpolation matrix, which includes the cases of both variable and random shape parameters. We prove a sufficient condition for that these interpolation matrices are invertible almost surely for the choice of shape parameters. The proof is then extended to the case of anisotropic Gaussian kernels, which is subjected to independent componentwise scalings and rotations. As a corollary of our proof, we propose a parameter free random shape parameters strategy to completely eliminate the need of users’ inputs. By studying numerical accuracy in variable precision computations, we demonstrate that the asymmetric interpolation method is not a method with faster theoretical convergence. We show empirically in double precision, however, that these spatially varying strategies have the ability to outperform constant shape parameters in double precision computations. Various random distributions were numerically examined.
Source Publication Title
Applied Mathematics and Computation
Link to Publisher's Edition
Chiu, S., Ling, L., & McCourt, M. (2020). On variable and random shape Gaussian interpolations. Applied Mathematics and Computation, 377. https://doi.org/10.1016/j.amc.2020.125159
Available for download on Monday, August 01, 2022