Matrix: QCD/conf5_4-8x8-20

Description: Quantum chromodynamics conf5.4-00l8x8-2000

QCD/conf5_4-8x8-20 graph QCD/conf5_4-8x8-20 graph
(bipartite graph drawing) (graph drawing of A+A')

QCD/conf5_4-8x8-20 dmperm of QCD/conf5_4-8x8-20

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: QCD
  • Click here for a description of the QCD group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups
  • download as a MATLAB mat-file, file size: 11 MB. Use UFget(1601) or UFget('QCD/conf5_4-8x8-20') in MATLAB.
  • download in Matrix Market format, file size: 15 MB.
  • download in Rutherford/Boeing format, file size: 10 MB.

    Matrix properties
    number of rows49,152
    number of columns49,152
    nonzeros1,916,928
    structural full rank?yes
    structural rank49,152
    # of blocks from dmperm2
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 92%
    numeric value symmetry 46%
    typecomplex
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorB. Medeke
    editorR. Boisvert, R. Pozo, K. Remington, B. Miller, R. Lipman, R. Barrett, J. Dongarra
    date1999
    kindtheoretical/quantum chemistry problem
    2D/3D problem?no

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD199,279,728
    Cholesky flop count2.3e+12
    nnz(L+U), no partial pivoting, with AMD398,510,304
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD204,228,705
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD307,328,838

    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.