Matrix: HB/orani678

Description: UNSYMMETRIC MATRIX ORANI678 ST ERTAR 24OCT84

HB/orani678 graph HB/orani678 graph
(bipartite graph drawing) (graph drawing of A+A')


HB/orani678 dmperm of HB/orani678

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 460 KB. Use UFget(224) or UFget('HB/orani678') in MATLAB.
  • download in Matrix Market format, file size: 575 KB.
  • download in Rutherford/Boeing format, file size: 429 KB.

    Matrix properties
    number of rows2,529
    number of columns2,529
    nonzeros90,158
    structural full rank?yes
    structural rank2,529
    # of blocks from dmperm700
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 7%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorK. Pearson
    editorI. Duff, R. Grimes, J. Lewis
    date1984
    kindeconomic problem
    2D/3D problem?no

    Additional fieldssize and type
    bsparse 2529-by-86

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD331,374
    Cholesky flop count1.4e+08
    nnz(L+U), no partial pivoting, with AMD660,219
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD277,111
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,193,273

    SVD-based statistics:
    norm(A)31.9856
    min(svd(A))0.0033388
    cond(A)9579.95
    rank(A)2,529
    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/orani678 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.