Matrix: HB/west0655

Description: U 16 STAGE COLUMN SECTION, SOME STAGES SIMPLIFIED ( CHEM. ENG. )

HB/west0655 graph HB/west0655 graph
(bipartite graph drawing) (graph drawing of A+A')


HB/west0655 dmperm of HB/west0655
scc of HB/west0655

  • Home page of the 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: 17 KB. Use UFget(269) or UFget('HB/west0655') in MATLAB.
  • download in Matrix Market format, file size: 16 KB.
  • download in Rutherford/Boeing format, file size: 15 KB.

    Matrix properties
    number of rows655
    number of columns655
    nonzeros2,808
    structural full rank?yes
    structural rank655
    # of blocks from dmperm198
    # strongly connected comp.2
    explicit zero entries46
    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:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD32,584
    Cholesky flop count4.0e+06
    nnz(L+U), no partial pivoting, with AMD64,513
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD6,358
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD12,688

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 46 explicit zero entries.

    SVD-based statistics:
    norm(A)318952
    min(svd(A))9.77241e-07
    cond(A)3.2638e+11
    rank(A)655
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    HB/west0655 svd

    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.