HB/west0479 graph

Matrix: HB/west0479

Description: U 8 STAGE COLUMN SECTION, ALL SECTIONS RIGOROUS ( CHEM. ENG. )

  • UF Sparse Matrix Collection
  • Matrix group: HB
  • Click here for a description of the HB group.
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  • download as a MATLAB mat-file, file size: 13 KB. Use UFget(267) or UFget('HB/west0479') in MATLAB.
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    HB/west0479

    dmperm of HB/west0479

    scc of HB/west0479

    Matrix properties
    number of rows479
    number of columns479
    nonzeros1,888
    structural full rank?yes
    structural rank479
    # of blocks from dmperm166
    # strongly connected comp.2
    entries not in dmperm blocks468
    explicit zero entries22
    nonzero pattern symmetry 1%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorA. Westerberg
    editorI. Duff, R. Grimes, J. Lewis
    date1983
    kindchemical process simulation problem
    2D/3D problem?no

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))14,819 18,480 2,821
    Cholesky flop count1.1e+06 1.6e+06 3.6e+04
    nnz(L+U), no partial pivoting29,159 36,481 5,631
    nnz(V) for QR, upper bound nnz(L) for LU3,921 3,681 2,444
    nnz(R) for QR, upper bound nnz(U) for LU7,539 9,053 5,166

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 22 explicit zero entries.

    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.