Matrix: HB/nnc1374

Description: U NATIONAL NUCLEAR CORP. FISSION REACTOR SIESMIC STUDIES

HB/nnc1374 graph HB/nnc1374 graph
(bipartite graph drawing) (graph drawing of A+A')


HB/nnc1374 dmperm of HB/nnc1374

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 14 KB. Use UFget(214) or UFget('HB/nnc1374') in MATLAB.
  • download in Matrix Market format, file size: 32 KB.
  • download in Rutherford/Boeing format, file size: 18 KB.

    Matrix properties
    number of rows1,374
    number of columns1,374
    nonzeros8,588
    structural full rank?yes
    structural rank1,374
    # of blocks from dmperm57
    # strongly connected comp.1
    explicit zero entries18
    nonzero pattern symmetry 82%
    numeric value symmetry 59%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorNational Nuclear Corp.
    editorI. Duff, R. Grimes, J. Lewis
    date1982
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD13,888
    Cholesky flop count2.2e+05
    nnz(L+U), no partial pivoting, with AMD26,402
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD34,806
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD76,396

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 18 explicit zero entries.

    SVD-based statistics:
    norm(A)1102.12
    min(svd(A))2.9585e-12
    cond(A)3.72526e+14
    rank(A)1,308
    sprank(A)-rank(A)66
    null space dimension66
    full numerical rank?no
    singular value gap5.69136

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

    HB/nnc1374 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.