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

    Maintained by Tim Davis, last updated 01-Apr-2011.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.