social network of dolphins, Doubtful Sound, New Zealand
Name dolphins
Group Newman
Matrix ID 2396
Num Rows 62
Num Cols 62
Nonzeros 318
Pattern Entries 318
Kind Undirected Graph
Symmetric Yes
Date 2003
Author D. Lusseau
Editor M. Newman
Structural Rank
Structural Rank Full
Num Dmperm Blocks
Strongly Connect Components 1
Num Explicit Zeros 0
Pattern Symmetry 100%
Numeric Symmetry 100%
Cholesky Candidate no
Positive Definite no
Type binary
SVD Statistics
Matrix Norm 7.193614e+00
Minimum Singular Value 4.603053e-17
Condition Number 1.562792e+17
Rank 60
Null Space Dimension 2
Full Numerical Rank? no
Download Singular Values MATLAB
Download MATLAB Rutherford Boeing Matrix Market
Network collection from M. Newman                                                                
The graph dolphins contains an undirected social network of frequent       
associations between 62 dolphins in a community living off Doubtful Sound, 
New Zealand, as compiled by Lusseau et al. (2003).  Please cite            
  D. Lusseau, K. Schneider, O. J. Boisseau, P. Haase, E. Slooten, and      
  S. M. Dawson, The bottlenose dolphin community of Doubtful Sound features
  a large proportion of long-lasting associations, Behavioral Ecology and  
  Sociobiology 54, 396-405 (2003).                                         
Additional information on the network can be found in                      
  D. Lusseau, The emergent properties of a dolphin social network,         
  Proc. R. Soc. London B (suppl.) 270, S186-S188 (2003).                   
  D. Lusseau, Evidence for social role in a dolphin social network,        
  Preprint q-bio/0607048 (