**Matrix: Newman/celegansneural**

Description: Neural network of the nematode C. Elegans

(bipartite graph drawing) | (graph drawing of A+A') |

Matrix properties | |

number of rows | 297 |

number of columns | 297 |

nonzeros | 2,345 |

# strongly connected comp. | 57 |

explicit zero entries | 0 |

nonzero pattern symmetry | 17% |

numeric value symmetry | 5% |

type | integer |

structure | unsymmetric |

Cholesky candidate? | no |

positive definite? | no |

author | J. White, E. Southgate, J. Thompson, S. Brenner |

editor | D. Watts, S. Strogatz |

date | 1998 |

kind | directed weighted graph |

2D/3D problem? | no |

Additional fields | size and type |

nodename | full 297-by-3 |

Notes:

Network collection from M. Newman http://www-personal.umich.edu/~mejn/netdata/ Neural network of the nematode C. Elegans Compiled by Duncan Watts and Steven Strogatz from original experimental data by White et al. The graph celegansneural describes a weighted, directed network representing the neural network of C. Elegans. The data were taken from the web site of Prof. Duncan Watts at Columbia University, http://cdg.columbia.edu/cdg/datasets. The nodes in the original data were not consecutively numbered, so they have been renumbered to be consecutive. The original node numbers from Watts' data file are retained as the labels of the nodes. Edge weights are the weights given by Watts. These data can be cited as: J. G. White, E. Southgate, J. N. Thompson, and S. Brenner, "The structure of the nervous system of the nematode C. Elegans", Phil. Trans. R. Soc. London 314, 1-340 (1986). D. J. Watts and S. H. Strogatz, "Collective dynamics of `small-world networks", Nature 393, 440-442 (1998).

SVD-based statistics: | |

norm(A) | 183.876 |

min(svd(A)) | 0 |

cond(A) | Inf |

rank(A) | 248 |

null space dimension | 49 |

full numerical rank? | no |

singular value gap | 1.59671e+12 |

singular values (MAT file): | click here |

SVD method used: | s = svd (full (A)) ; |

status: | ok |

For a description of the statistics displayed above, click here.

*Maintained by Tim Davis, last updated 12-Mar-2014.Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.
*