Matrix: HB/bcsstm12

Description: SYMMETRIC MASS MATRIX, ORE CAR (CONSISTENT MASSES)

HB/bcsstm12 graph
(undirected graph drawing)


HB/bcsstm12 dmperm of HB/bcsstm12

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 59 KB. Use UFget(67) or UFget('HB/bcsstm12') in MATLAB.
  • download in Matrix Market format, file size: 61 KB.
  • download in Rutherford/Boeing format, file size: 38 KB.

    Matrix properties
    number of rows1,473
    number of columns1,473
    nonzeros19,659
    structural full rank?yes
    structural rank1,473
    # of blocks from dmperm10
    # strongly connected comp.10
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    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 AMD29,270
    Cholesky flop count7.9e+05
    nnz(L+U), no partial pivoting, with AMD57,067
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD38,600
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD73,715

    SVD-based statistics:
    norm(A)13.4156
    min(svd(A))2.11871e-05
    cond(A)633196
    rank(A)1,473
    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/bcsstm12 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.