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CAA: Stable kernelbased approximation and applications
Kernelbased approximation have become particularly popular in the last decades
especially with the use of RBF (Radial Basis Functions). Our research is addressed
primarily to the analysis and construction of stable bases and their use
in image reconstruction from Radon data and meshless approximations.
People: S. De Marchi (coordinator),
A. Martínez Calomardo, F. Marchetti ,
E. Perracchione, D. Poggiali (Padova)
Collaborators: M. Buhmann (Giessen),
R. Cavoretto (Torino), A. De Rossi (Torino), B. Haasdonk (Stuttgart),
A. Iske (Hamburg), M. Rossini (Milano), G. Santin (Stuttgart), R. Schaback (Goettingen), H. Wendland (Bayreuth).
Papers
 On the Convergence of the Rescaled Localized Radial Basis
Function Method
draft (July 2019), with H. Wendland. Appl. Math. Letters (2020) online

Analysis of a new class of rational RBF expansions
by M. Buhmann, S. De Marchi and E. Perracchione, Accepted by IMA J. Numer. Anal. (2018)
 Recursive POD expansion for advectiondiffusionreaction equation
by M. Azaïez, T. Chácon Rebollo, E. Perracchione, J. M. Vega,
to appear on Comm. Comput. Physics, 2018, doi: 10.4208/cicp.OA20170257.
 Interpolation with uncoupled separable matrixvalued kernels
by D. Wittwar, G. Santin, B. Haasdonk
Dolomites Res. Notes Approx. 11, Special Issue SPAN2018, pp. 2339 (2018)
 Greedy kernel methods for accelerating implicit integrators for parametric ODEs
by T. Brünnette, G. Santin, and B. Haasdonk
Proceedings of ENUMATH 2017. (2018)

RBFbased partition of unity methods for elliptic PDEs: Adaptivity and stability issues via VSKs
by S. De Marchi, A. Martinez, E. Perracchione and M. Rossini,
J. Sci. Comput. 79(1) (2019), pp. 321344. online version

Fast and stable rational RBFbased Partition of Unity interpolation
by S. De Marchi, A. Martinez, E. Perracchione. J. Comput. Appl. Math. 349 (2019), pp. 331343
online
 Image Reconstruction from Scattered Radon Data by Weighted Positive Definite Kernel Functions
by S. De Marchi, A. Iske and G. Santin, Calcolo 55(2) (2018), https://doi.org/10.1007/s1009201802476.
 Convergence rate of the dataindependent Pgreedy algorithm in kernelbased approximation
by G. Santin and B. Haasdonk, Dolomites Res. Notes on Approx. 10 (2017), pp. 6878.

Optimal selection of local
approximants in RBFPU interpolation using bivariate LOOCV
arXiv preprint 1703.04282  R. Cavoretto, A. De Rossi and
E. Perracchione
J. Sci. Comput., to appear
 A rescaled method for RBF approximation
by S. De Marchi, A. Idda and G. Santin
Springer Proceedings on Mathematics and Statistics, Vol. 201 (2017), pp.3959.

Partition of unity interpolation using stable kernelbased techniques
by R. Cavoretto, S. De Marchi, A. De Rossi, E. Perracchione
and G. Santin
Appl. Numer. Math. 116 (2017), pp. 95107
online, http://dx.doi.org/10.1016/j.apnum.2016.07.005
 Kernelbased Image Reconstruction from Scattered Radon Data
by S. De Marchi, A. Iske and A. Sironi
Dolomites Res. Notes on Approx. Vol 9 (2016), special issue for the workshop "Kernelbased methods and function approximation", pp. 1931.
available as Hamburger Beitraege
zur Angewandten Mathematik 201611

Approximation of Eigenfunctions in Kernelbased Spaces
by G. Santin and R. Schaback
Adv. Comput. Math. 42(4) (2016), pp. 973993.

RBF approximation of large datasets by partition of unity
and local stabilization
by R. Cavoretto, S. De Marchi, A. De Rossi, E. Perracchione
and G. Santin
Proceedings CMMSE (2015), Vol. IIIIIIIV, pp. 317326.

Fast computation of orthonormal basis for RBF spaces through Krylov space methods
by S. De Marchi and G. Santin
BIT Numerical Mathematics 55(4) (2015), pp. 949966.

A new stable basis for radial basis function interpolation
by S. De Marchi and G. Santin
J. Comp. Appl. Math., Vol. 253 (2013), pp. 113.

Stability of KernelBased Interpolation
by S. De Marchi and R. Schaback
Adv. Comput. Math. Vol. 32(2), 2010, p. 155161
Examples and more:
these are examples and figures illustrating the results of the paper "Stability of KernelBased Interpolation".

Nonstandard Kernels and their Applications
by S. De Marchi and R. Schaback
Dolomites Res. Notes on Approx. (DRNA) Vol. 2, (2009), pp. 1643.

Univariate Radial Basis Functions with Compact Support Cardinal Functions
by L. Bos and S. De Marchi
East J. Approx., Vol. 14(1) 2008, pp. 6980.

NearOptimal Dataindependent Point Locations for Radial Basis Function Interpolation
by with R. Schaback and H. Wendland
Adv. Comput. Math. 23(3) (2005), pp. 317330.
Papers on applications
 A stable meshfree PDE solver for sourcetype flows in porous media
draft (Dec. 2018) with R. Campagna, S. Cuomo, E. Perracchione and G. Severino. Accepted by Appl. Num. Math.
 Learning with subsampled kernelbased methods: Environmental and financial applications
by M. Aminian Shahrokhabadi, A. Neisy, E. Perracchione, M. Polato, Dolomites Res. Notes Approx. 12(2019), pp. 1727.
 Greedy Kernel Approximation for Sparse Surrogate Modelling
by B. Haasdonk and G. Santin
.
in ReducedOrder Modeling (ROM) for Simulation and Optimization: Powerful Algorithms as Key Enablers for Scientific Computing,
W. Keiper, A. Milde, and S. Volkwein, Eds. Cham: Springer Int. Pub., 2018, pp. 2145.
 Comparison of
datadriven uncertainty quantification methods for a carbon dioxide storage benchmark scenario
by M. Köppel, F. Franzelin, I. Kröker, G. Santin, D. Wittwar, S. Oladyshkin, A. Barth, B. Haasdonk, W. Nowak, D. Pflüger, C. Rohde,
Accepted for publication in Comput. Geosci.
 Numerical modelling of a peripheral arterial stenosis using dimensionally reduced models and kernel
methods,
by T. Köppl, G. Santin, B. Haasdonk, R. Helmig
Int. J. Numer. Meth. Biomed. Engng., vol 34, 8 (2018), pg. e3095
 Rational RBFbased partition of unity method for efficiently
and accurately approximating 3D objects
by E. Perracchione, arXiv preprint arXiv:1802.01842, 2018. To appear in Comput. Appl. Math.

Approximating basins of attraction for dynamical systems
via stable radial bases
preprint  R. Cavoretto, S. De Marchi, A. De Rossi, E. Perracchione
and G. Santin
AIP Conference Proceedings, 1738, 390003 (2016); doi:10.1063/1.4952177
online
Submitted
 On the Convergence of the Rescaled Localized Radial Basis
Function Method
by S. De Marchi and H. Wendland (May 2019)

ShapeDriven Interpolation with Discontinuous Kernels: Error Analysis, Edge Extraction and Applications in MPI
by S. De Marchi, W. Erb, F. Marchetti, E. Perracchione and M. Rossini (March 2109)
 A stable meshfree PDE solver for sourcetype flows in porous media
R. Campagna, S. Cuomo, S. De Marchi, E. Perracchione and G. Severino, submitted (Dec. 2018)
 Greedy regularized kernel interpolation
G. Santin, D. Wittwar, B. Haasdonk, submitted (2018).
 Jumping with Variably Scaled Discontinuos Kernels (VSDK)
by S. De Marchi, F. Marchetti and E. Perracchione. submitted (Aug. 2018)
Posters
 Smooth kernel machines for environment and finance
by M. Aminian Shahrokhabadi, E. Perracchione, M. Polato, M. Putti
poster presented at the "Dolomites Research Week on Approximation 2018", Alba di Canazei (Italy), Sept. 2018.

Rational stable RBFPU interpolation via VSKs
by S. De Marchi, A. Martinez and E. Perracchione
poster presented at the "Dolomites Research Week on Approximation 2017", Alba di Canazei (Italy), Sept. 2017.
 A rescaled method for RBF approximation
by S. De Marchi, A. Idda and G. Santin
poster presented at "4th Workshop on Constructive Approximation and Applications", Alba di Canazei (TN Italy), Sept. 2016.
 Kernel methods for Radon transform
by S. Guglielmo and G. Santin
poster presented at International CAE Conference 2013, Pacengo del Garda (Italy), Oct. 2013.

WSVD basis for RBF and Krylov subspaces
by S. De Marchi and G. Santin
poster presented at the "Dolomites Research Week on Approximation 2013", Alba di Canazei (Italy), Sept. 2013.

A New Stable Basis for RBF Approximation
by S. De Marchi and G. Santin
poster presented at the "Dolomites Research Week on Approximation 2012", Alba di Canazei (Italy), Sept. 2012.
Software
Books
Meshfree Approximation for MultiAsset European and American Option Problems
by Stefano De Marchi, Maddalena Mandarà and Anna Viero
ISBN: 9788854851511 (2012), pp. 92.
Lecture Notes
Four Lectures on radial basis functions by S. De Marchi and E. Perracchione (2015), pp. 112
Presentations
 S. De Marchi: New developments on rational RBF
 S. De Marchi: Kernelbased Image
Reconstruction from scattered Radon data by (anisotropic) positive definite functions
Kernelbased methods and function approximation  Department of Mathematics, University of Torino (Italy), February 5th, 2016.
 S. De Marchi: On a new orthonormal basis for RBF native spaces and its fast computation
Colloqium at the Department of Mathematics, University of Torino (Italy), on June 11th, 2014.
 G. Santin: A fast algorithm for computing a truncated orthonormal basis for RBF native spaces
Multivariate Approximation, Verona 2930 November, 2013.
 S. De Marchi: On a new orthonormal basis for RBF native spaces
San Diego (USA), SIAM Annual meeting: July 8th, 2013.
PhD theses
Master theses
 Medical image reconstruction using kernel based methods, candidate: Amos Sironi,
University of Padua, A. Y. 201011.
 A new stable basis for RBF approximation, candidate: Gabriele Santin, University
of Padua, A. Y. 201112.
 Radial basis functions networks for ODEs: application to diabetes and insulin
therapy models, candidate: Giulia Antinori, University of Padua, A. Y. 201112.
 A Scilab radial basis functions toolbox, candidate: Anna Bassi, University of
Padua, A. Y. 201112.
 Reconstruction of medical images from Radon data in trasmission and emission
tomography, candidate: Davide Poggiali, University of Padua, A. Y. 201112.~demarchi/
 Kernelbased medical image reconstruction, candidate: Maria Angela Narduzzo,
University of Padua, A. Y. 201314.
 Kernelbased medical image reconstruction from Radon data, candidate: Silvia
Guglielmo, University of Padua, A. Y. 201314.
 A comparison of some RBF interpolation methods: theory and numerics, candidate:
Andrea Idda, University of Padova, A.Y. 201415.
 Numerical solution of PDEs on general surfaces by RBFs, candidate: Sara Carlino,
University of Padova, A.Y. 201516.
 A partition of unity radial basis functions method for solving PDEs, candidate: Danilo Stocchino, University of Padova A. Y. 201718.
Degree theses
 Radial basis functions approximation for European call option price, candidate:
Maddalena Mandarà, University of Verona, A. Y. 200708.
 Meshfree approximation for multiasset American option problems, candidate: Anna
Viero, University of Verona, A. Y. 200708.