Matrix: HB/bcsstm04

Description: SYMMETRIC MASS MATRIX, OIL RIG, NOT CONDENSED (SAME MODEL AS BCSSTX02)

HB/bcsstm04 graph
(undirected graph drawing)


HB/bcsstm04 dmperm of HB/bcsstm04
scc of HB/bcsstm04

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 988 bytes. Use UFget(59) or UFget('HB/bcsstm04') in MATLAB.
  • download in Matrix Market format, file size: 1 KB.
  • download in Rutherford/Boeing format, file size: 1 KB.

    Matrix properties
    number of rows132
    number of columns132
    nonzeros66
    structural full rank?no
    structural rank66
    # of blocks from dmperm68
    # strongly connected comp.132
    explicit zero entries66
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorJ. Lewis
    editorI. Duff, R. Grimes, J. Lewis
    date1982
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD132
    Cholesky flop count1.3e+02
    nnz(L+U), no partial pivoting, with AMD132
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD132
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD132

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 66 explicit zero entries.

    SVD-based statistics:
    norm(A)0.172829
    min(svd(A))0
    cond(A)Inf
    rank(A)66
    sprank(A)-rank(A)0
    null space dimension66
    full numerical rank?no
    singular value gapInf

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

    HB/bcsstm04 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.