Results 1  10
of
141,995
Combinatorial Algorithms for Compressed Sensing
 In Proc. of SIROCCO
, 2006
"... Abstract — In sparse approximation theory, the fundamental problem is to reconstruct a signal A ∈ R n from linear measurements 〈A, ψi 〉 with respect to a dictionary of ψi’s. Recently, there is focus on the novel direction of Compressed Sensing [1] where the reconstruction can be done with very few—O ..."
Abstract

Cited by 116 (1 self)
 Add to MetaCart
prior work in other areas including Learning Theory [4], [5], Streaming algorithms [6], [7], [8] and Complexity Theory [9] for this case. Our approach is combinatorial. In particular, we use two parallel sets of group tests, one to filter and the other to certify and estimate; the resulting algorithms
PrimalDual Combinatorial Algorithms
"... Linear program and its duality have long been ubiquitous tools for analyzing NPhard problems and designing fast approximation algorithms. Plotkin et al proposed a primaldual combinatorial algorithm based on linear duality for fractional packing and covering, which achieves significant speedup on a ..."
Abstract
 Add to MetaCart
Linear program and its duality have long been ubiquitous tools for analyzing NPhard problems and designing fast approximation algorithms. Plotkin et al proposed a primaldual combinatorial algorithm based on linear duality for fractional packing and covering, which achieves significant speedup on a
Regularity lemmas and combinatorial algorithms
 In Proc. FOCS
"... Abstract — We present new combinatorial algorithms for Boolean matrix multiplication (BMM) and preprocessing a graph to answer independent set queries. We give the first asymptotic improvements on combinatorial algorithms for dense BMM in many years, improving on the “Four Russians ” O(n 3 /(w log n ..."
Abstract

Cited by 19 (3 self)
 Add to MetaCart
Abstract — We present new combinatorial algorithms for Boolean matrix multiplication (BMM) and preprocessing a graph to answer independent set queries. We give the first asymptotic improvements on combinatorial algorithms for dense BMM in many years, improving on the “Four Russians ” O(n 3 /(w log
A Combinatorial Algorithm for the Determinant
 In Proceedings of the 8th Annual ACMSIAM Symposium on Discrete Algorithms
, 1997
"... We show the first efficient combinatorial algorithm for the computation of the determinant. Hitherto, all (known) algorithms for determinant have been based on linear algebra. In contrast, our algorithm and its proof of correctness are totally combinatorial in nature. The algorithm requires no divis ..."
Abstract

Cited by 13 (1 self)
 Add to MetaCart
We show the first efficient combinatorial algorithm for the computation of the determinant. Hitherto, all (known) algorithms for determinant have been based on linear algebra. In contrast, our algorithm and its proof of correctness are totally combinatorial in nature. The algorithm requires
A Combinatorial Algorithm for Pfaffians
, 1999
"... The Pfaffian of a graph is closely linked to Perfect Matching. It is also naturally related to the determinant of an appropriately defined matrix. This relation between Pfaffian and determinant is usually exploited to give a fast algorithm for computing Pfaffians. We present the first completely ..."
Abstract

Cited by 2 (1 self)
 Add to MetaCart
completely combinatorial algorithm for computing the Pfaffian in polynomial time. In fact, we show that it can be computed in the complexity class GapL; this result was not known before. Our proof techniques generalize the recent combinatorial characterization of determinant [MV97] in novel ways. As a
Randomised Techniques in Combinatorial Algorithmics
, 1999
"... ix Chapter 1 Introduction 1 1.1 Algorithmic Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Technical Preliminaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2.1 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ..."
Abstract

Cited by 22 (7 self)
 Add to MetaCart
ix Chapter 1 Introduction 1 1.1 Algorithmic Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Technical Preliminaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2.1 Problems
A SIMPLE COMBINATORIAL ALGORITHM
"... Abstract. This note presents a combinatorial method to construct a De Bruijn cycle for any order n. 1. ..."
Abstract
 Add to MetaCart
Abstract. This note presents a combinatorial method to construct a De Bruijn cycle for any order n. 1.
Combinatorial Algorithms for Approximate Words
"... The search and the analysis of motifs on the genome and the proteome is a very active domain in computational biology. The socalled formal approaches search for exceptional words on an entire genome, or some part of it. The specificity of our algorithmic approach is the combination of recent re ..."
Abstract
 Add to MetaCart
results in probability and combinatorics with highlevel pattern matching algorithms. In this paper, we will concentrate on approximate words. We extend the usual notion of consensus. We provide some combinatorial properties of the approximate words and show how to take advantage of them to assess
Combinatorial Algorithms for the Generalized Circulation Problem
 MATHEMATICS OF OPERATIONS RESEARCH
, 1989
"... We consider a generalization of the maximum flow problem in which the amounts of flow entering and leaving an arc are linearly related. More precisely, if x(e) units of flow enter an arc e, x(e)fl(e) units arrive at the other end. For instance, nodes of the graph can correspond to different curre ..."
Abstract

Cited by 36 (4 self)
 Add to MetaCart
. In this paper we present the first polynomial time combinatorial algorithms for this problem. The algorithms are simple and intuitive.
Combinatorics Combinatorial algorithm
"... This paper presents a piece of software for the visualization or navigation in trees. It allows some operations as comparison between trees or finding common subtrees. It means a presentation of common things with same colors. Overall implemented tools are strongly based on intrinsic combinatorial p ..."
Abstract
 Add to MetaCart
This paper presents a piece of software for the visualization or navigation in trees. It allows some operations as comparison between trees or finding common subtrees. It means a presentation of common things with same colors. Overall implemented tools are strongly based on intrinsic combinatorial
Results 1  10
of
141,995