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

  • Matrix: Kamvar/Stanford
  • Description: Sep Kamvar. Stanford web. aij=1 is link from page j to page i
  • download as a MATLAB mat-file, file size: 6 MB. Use UFget(979) or UFget('Kamvar/Stanford') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Kamvar/Stanford

    scc of Kamvar/Stanford

    Kamvar/Stanford graph

    Matrix properties
    number of rows281,903
    number of columns281,903
    nonzeros2,312,497
    structural full rank?no
    structural rank192,557
    # of blocks from dmperm34,486
    # strongly connected comp.29,914
    explicit zero entries0
    nonzero pattern symmetry 28%
    numeric value symmetry 28%
    typebinary
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorS. Kamvar
    editorT. Davis
    date2003
    kinddirected graph
    2D/3D problem?no

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))7,091,779 6,360,372
    Cholesky flop count3.5e+09 2.3e+09
    nnz(L+U), no partial pivoting13,901,655 12,438,841
    nnz(V) for QR, upper bound nnz(L) for LU634,999,219 -
    nnz(R) for QR, upper bound nnz(U) for LU1,468,820,495 -

    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.