GHS_indef/aug3dcqp graph

Matrix: GHS_indef/aug3dcqp

Description: Gould, Hu, & Scott: expanded system-3D PDE (CUTEr)

  • UF Sparse Matrix Collection
  • Matrix group: GHS_indef
  • Click here for a description of the GHS_indef 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: 442 KB. Use UFget(1218) or UFget('GHS_indef/aug3dcqp') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    GHS_indef/aug3dcqp

    dmperm of GHS_indef/aug3dcqp

    scc of GHS_indef/aug3dcqp

    Matrix properties
    number of rows35,543
    number of columns35,543
    nonzeros128,115
    structural full rank?yes
    structural rank35,543
    # of blocks from dmperm2
    # strongly connected comp.2
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorN. Gould
    editorN. Gould
    date1994
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))923,509 1,057,586 2,956,674
    Cholesky flop count3.0e+08 2.9e+08 1.3e+09
    nnz(L+U), no partial pivoting1,811,475 2,079,629 5,877,805
    nnz(V) for QR, upper bound nnz(L) for LU6,562,149 3,589,806 3,327,875
    nnz(R) for QR, upper bound nnz(U) for LU11,649,713 6,784,750 6,295,074

    Maintained by Tim Davis, last updated 30-Sep-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.