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

  • Matrix: GHS_psdef/audikw_1
  • Description: symmetric rb matrix
  • download as a MATLAB mat-file, file size: 505 MB. Use UFget(1252) or UFget('GHS_psdef/audikw_1') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    GHS_psdef/audikw_1

    GHS_psdef/audikw_1 graph

    Matrix properties
    number of rows943,695
    number of columns943,695
    nonzeros77,651,847
    structural full rank?yes
    structural rank943,695
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorS. Mayer
    editorJ. Koster
    date2004
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))2.326482e+09 -
    Cholesky flop count2.1e+13 -
    nnz(L+U), no partial pivoting4.652020e+09 -
    nnz(V) for QR, upper bound nnz(L) for LU- -
    nnz(R) for QR, upper bound nnz(U) for LU- -

    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.