Matrix: HB/bcsstm26

Description: SYMMETRIC MASS MATRIX - REACTOR CONTAINMENT FLOOR -- SECTION

HB/bcsstm26 graph
(undirected graph drawing)

HB/bcsstm26 dmperm of HB/bcsstm26

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 14 KB. Use UFget(76) or UFget('HB/bcsstm26') in MATLAB.
  • download in Matrix Market format, file size: 17 KB.
  • download in Rutherford/Boeing format, file size: 14 KB.

    Matrix properties
    number of rows1,922
    number of columns1,922
    nonzeros1,922
    structural full rank?yes
    structural rank1,922
    # of blocks from dmperm1,922
    # strongly connected comp.1,922
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorA. Mera, R. Cigel, J. Lewis
    editorI. Duff, R. Grimes, J. Lewis
    date1984
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,922
    Cholesky flop count1.9e+03
    nnz(L+U), no partial pivoting, with AMD1,922
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD1,922
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,922

    SVD-based statistics:
    norm(A)1.5124
    min(svd(A))5.7821e-06
    cond(A)261567
    rank(A)1,922
    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/bcsstm26 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.