• UF Sparse Matrix Collection
  • Matrix group: Gleich
  • Click here for a description of the Gleich group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups

  • Matrix: Gleich/wb-edu
  • Description: *.edu web pages, A(i,j)=1 if page i links to page j (2001)
  • download as a MATLAB mat-file, file size: 63 MB. Use UFget(1842) or UFget('Gleich/wb-edu') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Gleich/wb-edu

    scc of Gleich/wb-edu

    Gleich/wb-edu graph

    Matrix properties
    number of rows9,845,725
    number of columns9,845,725
    nonzeros57,156,537
    structural full rank?no
    structural rank5,000,334
    # of blocks from dmperm1,057,611
    # strongly connected comp.4,269,022
    explicit zero entries0
    nonzero pattern symmetry 33%
    numeric value symmetry 33%
    typebinary
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorD. Gleich
    editorT. Davis
    date2001
    kinddirected graph
    2D/3D problem?no

    Notes:

    For nodenames, see http://www.cise.ufl.edu/research/sparse/aux/Gleich
This graph is a subset of the webbase-2001 graph in the collection:  
http://law.dsi.unimi.it/index.php?option=com_include&Itemid=65       
This was a web crawl performed at Stanford in 2001.

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))2.396961e+09 -
    Cholesky flop count9.4e+13 -
    nnz(L+U), no partial pivoting4.784077e+09 -
    nnz(V) for QR, upper bound nnz(L) for LU7.203900e+10 -
    nnz(R) for QR, upper bound nnz(U) for LU3.833193e+09 -

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.