Matrix: HB/bcsstm11

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

HB/bcsstm11 graph
(undirected graph drawing)

HB/bcsstm11 dmperm of HB/bcsstm11

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 5 KB. Use UFget(66) or UFget('HB/bcsstm11') in MATLAB.
  • download in Matrix Market format, file size: 8 KB.
  • download in Rutherford/Boeing format, file size: 5 KB.

    Matrix properties
    number of rows1,473
    number of columns1,473
    nonzeros1,473
    structural full rank?yes
    structural rank1,473
    # of blocks from dmperm1,473
    # strongly connected comp.1,473
    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 AMD1,473
    Cholesky flop count1.5e+03
    nnz(L+U), no partial pivoting, with AMD1,473
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD1,473
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,473

    SVD-based statistics:
    norm(A)31.5781
    min(svd(A))0.00026705
    cond(A)118248
    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/bcsstm11 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.