Matrix: Pothen/barth5

Description: barth5, with coordinates. From NASA, collected by Alex Pothen

Pothen/barth5 graph
(undirected graph drawing)


Pothen/barth5
Pothen/barth5 graph

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  • Matrix group: Pothen
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  • download as a MATLAB mat-file, file size: 375 KB. Use UFget(867) or UFget('Pothen/barth5') in MATLAB.
  • download in Matrix Market format, file size: 265 KB.
  • download in Rutherford/Boeing format, file size: 234 KB.

    Matrix properties
    number of rows15,606
    number of columns15,606
    nonzeros107,362
    structural full rank?yes
    structural rank15,606
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorNASA
    editorG. Kumfert, A. Pothen
    date2003
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    coordfull 15606-by-2

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD368,416
    Cholesky flop count1.8e+07
    nnz(L+U), no partial pivoting, with AMD721,226
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD529,120
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD996,860

    SVD-based statistics:
    norm(A)7.10978
    min(svd(A))0.000500972
    cond(A)14192
    rank(A)15,606
    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

    Pothen/barth5 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.