HB/young2c graph

Matrix: HB/young2c

Description: complex matrix from aero research, David Young, corrected CUA version

  • UF Sparse Matrix Collection
  • Matrix group: HB
  • Click here for a description of the HB 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: 8 KB. Use UFget(279) or UFget('HB/young2c') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    HB/young2c

    Matrix properties
    number of rows841
    number of columns841
    nonzeros4,089
    structural full rank?yes
    structural rank841
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 85%
    typecomplex
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorD. Young
    editorI. Duff, R. Grimes, J. Lewis
    date1984
    kindduplicate acoustics problem
    2D/3D problem?yes

    Notes:

    duplicate of HB/young1c

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))9,198 10,511
    Cholesky flop count1.6e+05 2.3e+05
    nnz(L+U), no partial pivoting17,555 20,181
    nnz(V) for QR, upper bound nnz(L) for LU15,517 16,340
    nnz(R) for QR, upper bound nnz(U) for LU27,859 29,571

    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.