Newman/celegansneural

Neural network of the nematode C. Elegans
Name celegansneural
Group Newman
Matrix ID 2392
Num Rows 297
Num Cols 297
Nonzeros 2,345
Pattern Entries 2,345
Kind Directed Weighted Graph
Symmetric No
Date 1998
Author J. White, E. Southgate, J. Thompson, S. Brenner
Editor D. Watts, S. Strogatz
Structural Rank
Structural Rank Full
Num Dmperm Blocks
Strongly Connect Components 57
Num Explicit Zeros 0
Pattern Symmetry 16.8%
Numeric Symmetry 4.9%
Cholesky Candidate no
Positive Definite no
Type integer
SVD Statistics
Matrix Norm 1.838757e+02
Minimum Singular Value 0
Condition Number Inf
Rank 248
sprank(A)-rank(A)
Null Space Dimension 49
Full Numerical Rank? no
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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).