Matrix: Arenas/email

Description: email interchange network, Univ. of Rovira i Virgili, Tarragona

Arenas/email graph
(undirected graph drawing)

Arenas/email

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  • Matrix group: Arenas
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  • download as a MATLAB mat-file, file size: 20 KB. Use UFget(2408) or UFget('Arenas/email') in MATLAB.
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  • download in Rutherford/Boeing format, file size: 12 KB.

    Matrix properties
    number of rows1,133
    number of columns1,133
    nonzeros10,902
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorR. Guimera, L. Danon, A. Diaz-Guilera, F. Giralt, A. Arenas
    editorA. Arenas
    date2003
    kindundirected graph
    2D/3D problem?no

    Notes:

    Arenas set: email network, Univ. of Rovira i Virgili, Tarragona           
http://deim.urv.cat/~aarenas/data/welcome.htm                             
                                                                          
Network of e-mail interchanges between members of the Univeristy Rovira   
i Virgili (Tarragona).  Data compiled by members of Alex Arenas' group.   
Reference: R. Guimera, L. Danon, A. Diaz-Guilera, F. Giralt and A. Arenas,
Physical Review E , vol. 68, 065103(R), (2003).

    SVD-based statistics:
    norm(A)20.747
    min(svd(A))5.59245e-19
    cond(A)3.70982e+19
    rank(A)1,091
    null space dimension42
    full numerical rank?no
    singular value gap3.04809e+11

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    Arenas/email svd

    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.