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- research-articleMay 2021
A Strong Law of Large Numbers for Scrambled Net Integration
This article provides a strong law of large numbers for integration on digital nets randomized by a nested uniform scramble. The motivating problem is optimization over some variables of an integral over others, arising in Bayesian optimization. This ...
- research-articleJanuary 2017
Cubature, Approximation, and Isotropy in the Hypercube
Algorithms that combat the curse of dimensionality take advantage of nonuniformity properties of the underlying functions, which may be rotational (e.g., grid alignment) or translational (e.g., near-singularities localized at certain points of the domain). ...
- research-articleJuly 2015
Subspace condensation: full space adaptivity for subspace deformations
ACM Transactions on Graphics (TOG), Volume 34, Issue 4Article No.: 76, Pages 1–9https://doi.org/10.1145/2766904Subspace deformable body simulations can be very fast, but can behave unrealistically when behaviors outside the prescribed subspace such as novel external collisions, are encountered. We address this limitation by presenting a fast, flexible new method ...
- research-articleJuly 2014
Simulating articulated subspace self-contact
ACM Transactions on Graphics (TOG), Volume 33, Issue 4Article No.: 106, Pages 1–9https://doi.org/10.1145/2601097.2601181We present an efficient new subspace method for simulating the self-contact of articulated deformable bodies, such as characters. Self-contact is highly structured in this setting, as the limited space of possible articulations produces a predictable set ...
- research-articleJuly 2013
Subspace fluid re-simulation
ACM Transactions on Graphics (TOG), Volume 32, Issue 4Article No.: 62, Pages 1–9https://doi.org/10.1145/2461912.2461987We present a new subspace integration method that is capable of efficiently adding and subtracting dynamics from an existing high-resolution fluid simulation. We show how to analyze the results of an existing high-resolution simulation, discover an ...
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- research-articleJanuary 2013
Improving Point Selection in Cubature by a New Discrepancy
SIAM Journal on Scientific Computing (SISC), Volume 35, Issue 5Pages A2121–A2149https://doi.org/10.1137/12089377XReasonable point set selection is of paramount importance to the accuracy of high-dimensional integrals that will be encountered in various disciplines. In the present paper, to improve the point selection and to overcome the computational complexity of ...
- research-articleJanuary 2013
Generating Moment Matching Scenarios Using Optimization Techniques
SIAM Journal on Optimization (SIOPT), Volume 23, Issue 2Pages 963–999https://doi.org/10.1137/110858082An optimization based method is proposed to generate moment matching scenarios for numerical integration and its use in stochastic programming. The main advantage of the method is its flexibility: it can generate scenarios matching any prescribed set of ...
- articleMarch 2011
On Gauss-Lobatto Integration on the Triangle
SIAM Journal on Numerical Analysis (SINUM), Volume 49, Issue 2Pages 541–548https://doi.org/10.1137/100792263A recent result in [B. T. Helenbrook, SIAM J. Numer. Anal., 47 (2009), pp. 1304-1318] on the nonexistence of Gauss-Lobatto cubature rules on the triangle is strengthened by establishing a lower bound for the number of nodes of such rules. A method of ...
- articleJanuary 2007
A Cardinal Function Algorithm for Computing Multivariate Quadrature Points
SIAM Journal on Numerical Analysis (SINUM), Volume 45, Issue 1Pages 193–205https://doi.org/10.1137/050625801We present a new algorithm for numerically computing quadrature formulas for arbitrary domains which exactly integrate a given polynomial space. An effective method for constructing quadrature formulas has been to numerically solve a nonlinear set of ...
- articleAugust 2006
Cubature over the sphere S2 in Sobolev spaces of arbitrary order
Journal of Approximation Theory (JAPT), Volume 141, Issue 2Pages 118–133https://doi.org/10.1016/j.jat.2006.01.004This paper studies numerical integration (or cubature) over the unit sphere S2 ⊂ R3 for functions in arbitrary Sobolev spaces Hs (S2), s > 1. We discuss sequences (Qm(n))n∈N of cubature rules, where (i) the rule Qm(n) uses m(n) points and is assumed to ...
- articleDecember 2005
Optimal lower bounds for cubature error on the sphere S2
Journal of Complexity (JCOM), Volume 21, Issue 6Pages 790–803We show that the worst-case cubature error E(Qm;Hs) of an m-point cubature rule Qm for functions in the unit ball of the Sobolev space Hs = Hs (S2), s > 1, has the lower bound E(Qm; Hs) ≥ csm-s/2, where the constant cs is independent of Qm and m. This ...
- articleFebruary 2005
Transforming low-discrepancy sequences from a cube to a simplex
Journal of Computational and Applied Mathematics (JCAM), Volume 174, Issue 1Pages 29–42https://doi.org/10.1016/j.cam.2004.03.019Sequences of points with a low discrepancy are the basic building blocks for quasi-Monte Carlo methods. Traditionally these points are generated in a unit cube.To develop point sets on a simplex we will transform the low-discrepancy points from the unit ...
- articleAugust 2004
On the number of nodes in n-dimensional cubature formulae of degree 5 for integrals over the ball
Journal of Computational and Applied Mathematics (JCAM), Volume 169, Issue 2Pages 247–254https://doi.org/10.1016/j.cam.2003.12.024In this note cubature formulae of degree 5 are studied for n-dimensional integrals over the ball with constant weight function. We apply the method of reproducing kernel to show that the existence of such formulae attaining the best known lower bound is ...
- articleDecember 2003
Five- and six-dimensional lattice rules generated by structured matrices
Journal of Complexity (JCOM), Volume 19, Issue 6Pages 715–729https://doi.org/10.1016/j.jco.2003.08.001We describe the results of a computer-based search for five and six-dimensional lattice rules of specified trigonometric degree. In this search only lattice rules that can be generated by a circulant or skew-circulant generator matrix are considered, ...
- articleSeptember 2003
An adaptive numerical cubature algorithm for simplices
ACM Transactions on Mathematical Software (TOMS), Volume 29, Issue 3Pages 297–308https://doi.org/10.1145/838250.838254A globally adaptive algorithm for numerical cubature of a vector of functions over a collection of n-dimensional simplices is described. The algorithm is based on a subdivision strategy that chooses for subdivision at each stage the subregion (of the ...
Algorithm 824: CUBPACK: a package for automatic cubature; framework description
ACM Transactions on Mathematical Software (TOMS), Volume 29, Issue 3Pages 287–296https://doi.org/10.1145/838250.838253CUBPACK aims to offer a collection of re-usable code for automatic n-dimensional (n ≥ 1) numerical integration of functions over a collection of regions, i.e., quadrature and cubature. The current version allows this region to consist of a union of n-...
Algorithm 816: r2d2lri: an algorithm for automatic two-dimensional cubature
ACM Transactions on Mathematical Software (TOMS), Volume 28, Issue 1Pages 75–100https://doi.org/10.1145/513001.513006r2d2lri is a non-adaptive algorithm implemented in C++ for performing automatic cubature over a wide variety of finite and non-finite two-dimensional domains. The core integrator uses a sixth-order Sidi transformation applied to a sequence of embedded ...