Matrix: DNVS/halfb

Description: Gould, Hu, & Scott: half-breadth barge from Christian Damhaug

DNVS/halfb graph
(undirected graph drawing)

DNVS/halfb

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: DNVS
  • Click here for a description of the DNVS group.
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  • download as a MATLAB mat-file, file size: 3 MB. Use UFget(1265) or UFget('DNVS/halfb') in MATLAB.
  • download in Matrix Market format, file size: 13 MB.
  • download in Rutherford/Boeing format, file size: 4 MB.

    Matrix properties
    number of rows224,617
    number of columns224,617
    nonzeros12,387,821
    structural full rank?yes
    structural rank224,617
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorC. Damhaug
    editorN. Gould, Y. Hu, J. Scott
    date2004
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD62,591,821
    Cholesky flop count8.3e+10
    nnz(L+U), no partial pivoting, with AMD124,959,025
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD205,534,366
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD395,948,581

    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.