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- Nathan Bell, Michael Garland
- Proceedings of the Conference on High Performance…
- 2009

Sparse matrix-vector multiplication (SpMV) is of singular importance in sparse linear algebra. In contrast to the uniform regularity of dense linear algebra, sparse operations encounter a broad spectrum of matrices ranging from the regular to the highly irregular. Harnessing the tremendous potential of throughput-oriented processors for sparse operations… (More)

The massive parallelism of graphics processing units (GPUs) offers tremendous performance in many high-performance computing applications. While dense linear algebra readily maps to such platforms, harnessing this potential for sparse matrix computations presents additional challenges. Given its role in iterative methods for solving sparse linear systems… (More)

- Nathan Bell, Steven Dalton, Luke N. Olson
- SIAM J. Scientific Computing
- 2012

Algebraic multigrid methods for large, sparse linear systems are a necessity in many computational simulations, yet parallel algorithms for such solvers are generally decomposed into coarse-grained tasks suitable for distributed computers with traditional processing cores. However, accelerating multigrid methods on massively parallel throughput-oriented… (More)

- Lin Shi, Yizhou Yu, Nathan Bell, Wei-Wen Feng
- ACM Trans. Graph.
- 2006

In this paper, we present a multigrid technique for efficiently deforming large surface and volume meshes. We show that a previous least-squares formulation for distortion minimization reduces to a Laplacian system on a general graph structure for which we derive an analytic expression. We then describe an efficient multigrid algorithm for solving the… (More)

- Nathan Bell, Yizhou Yu, Peter J. Mucha
- Symposium on Computer Animation
- 2005

Granular materials, such as sand and grains, are ubiquitous. Simulating the 3D dynamic motion of such materials represents a challenging problem in graphics because of their unique physical properties. In this paper we present a simple and effective method for granular material simulation. By incorporating techniques from physical models, our approach… (More)

- Steven Dalton, Luke N. Olson, Nathan Bell
- ACM Trans. Math. Softw.
- 2015

Sparse matrix--matrix multiplication (SpGEMM) is a key operation in numerous areas from information to the physical sciences. Implementing SpGEMM efficiently on throughput-oriented processors, such as the graphics processing unit (GPU), requires the programmer to expose substantial fine-grained parallelism while conserving the limited off-chip memory… (More)

- Nathan Bell, Anil N. Hirani
- ACM Trans. Math. Softw.
- 2012

This article describes the algorithms, features, and implementation of PyDEC, a Python library for computations related to the discretization of exterior calculus. PyDEC facilitates inquiry into both physical problems on manifolds as well as purely topological problems on abstract complexes. We describe efficient algorithms for constructing the operators… (More)

- N Bell
- Annals of dyslexia
- 1991

Gestalt imagery-the ability to create imaged wholes-is a critical factor in oral and written language comprehension. Despite good decoding, good vocabulary, and adequate background experiences, many individuals experience weak gestalt imagery, thus processing "parts" rather than "wholes," from verbal stimuli, spoken or written. This contributes to a… (More)

- Nathan Bell, Luke N. Olson
- Numerical Lin. Alg. with Applic.
- 2008

SUMMARY In this paper we describe an aggregation-based algebraic multigrid method for the solution of discrete k-form Laplacians. Our work generalizes Reitzinger and Schöberl's algorithm to higher-dimensional discrete forms. We provide conditions on the tentative prolongators under which the commutativity of the coarse and fine de Rham complexes is… (More)

- David L Freedman, Meghna Swamy, Nathan C Bell, Mathew F Verce
- Applied and environmental microbiology
- 2004

Pseudomonas aeruginosa strain NB1 uses chloromethane (CM) as its sole source of carbon and energy under nitrate-reducing and aerobic conditions. The observed yield of NB1 was 0.20 (+/-0.06) (mean +/- standard deviation) and 0.28 (+/-0.01) mg of total suspended solids (TSS) mg of CM(-1) under anoxic and aerobic conditions, respectively. The stoichiometry of… (More)