### Abstract

over other, exponential-based measures. Its performance is illustrated on synthetic data, and we then show that it is able to reveal meaningful directed bipartite substructure in a network from neuroscience.

Language | English |
---|---|

Pages | 337-350 |

Number of pages | 14 |

Journal | ETNA - Electronic Transactions on Numerical Analysis |

Volume | 37 |

Publication status | Published - 2010 |

### Fingerprint

### Keywords

- bipartivity
- clustering
- communities
- exponential
- neuroscience,
- stickiness

### Cite this

*ETNA - Electronic Transactions on Numerical Analysis*,

*37*, 337-350.

}

*ETNA - Electronic Transactions on Numerical Analysis*, vol. 37, pp. 337-350.

**Mapping directed networks.** / Crofts, Jonathan; Estrada, Ernesto; Higham, Desmond; Taylor, Alan.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Mapping directed networks

AU - Crofts, Jonathan

AU - Estrada, Ernesto

AU - Higham, Desmond

AU - Taylor, Alan

PY - 2010

Y1 - 2010

N2 - We develop and test a new mapping that can be applied to directed unweighted networks. Although not a “matrix function” in the classical matrix theory sense, this mapping converts an unsymmetric matrix with entries of zero or one into a symmetric real-valued matrix of the same dimension that generally has both positive and negative entries. The mapping is designed to reveal approximate directed bipartite communities within a complex directed network; each such community is formed by two set of nodes S1 and S2 such that the connections involving these nodes are predominantly from a node in S1 and to a node in S2. The new mapping is motivated via the concept of alternating walks that successively respect and then violate the orientations of the links. Considering the combinatorics of these walks leads us to a matrix that can be neatly expressed via the singular value decomposition of the original adjacency matrix and hyperbolic functions. We argue that this new matrix mapping has advantages over other, exponential-based measures. Its performance is illustrated on synthetic data, and we then show that it is able to reveal meaningful directed bipartite substructure in a network from neuroscience.

AB - We develop and test a new mapping that can be applied to directed unweighted networks. Although not a “matrix function” in the classical matrix theory sense, this mapping converts an unsymmetric matrix with entries of zero or one into a symmetric real-valued matrix of the same dimension that generally has both positive and negative entries. The mapping is designed to reveal approximate directed bipartite communities within a complex directed network; each such community is formed by two set of nodes S1 and S2 such that the connections involving these nodes are predominantly from a node in S1 and to a node in S2. The new mapping is motivated via the concept of alternating walks that successively respect and then violate the orientations of the links. Considering the combinatorics of these walks leads us to a matrix that can be neatly expressed via the singular value decomposition of the original adjacency matrix and hyperbolic functions. We argue that this new matrix mapping has advantages over other, exponential-based measures. Its performance is illustrated on synthetic data, and we then show that it is able to reveal meaningful directed bipartite substructure in a network from neuroscience.

KW - bipartivity

KW - clustering

KW - communities

KW - exponential

KW - neuroscience,

KW - stickiness

M3 - Article

VL - 37

SP - 337

EP - 350

JO - ETNA - Electronic Transactions on Numerical Analysis

T2 - ETNA - Electronic Transactions on Numerical Analysis

JF - ETNA - Electronic Transactions on Numerical Analysis

SN - 1068-9613

ER -