Matrix: GHS_indef/sit100

Description: Aug. system modelling the underground of Straz pod Ralskem mine by MFE

GHS_indef/sit100 graph
(undirected graph drawing)


GHS_indef/sit100

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  • Matrix group: GHS_indef
  • Click here for a description of the GHS_indef group.
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  • download as a MATLAB mat-file, file size: 127 KB. Use UFget(1245) or UFget('GHS_indef/sit100') in MATLAB.
  • download in Matrix Market format, file size: 143 KB.
  • download in Rutherford/Boeing format, file size: 94 KB.

    Matrix properties
    number of rows10,262
    number of columns10,262
    nonzeros61,046
    structural full rank?yes
    structural rank10,262
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    author
    editorN. Gould, Y. Hu, J. Scott
    date2004
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD513,084
    Cholesky flop count8.9e+07
    nnz(L+U), no partial pivoting, with AMD1,015,906
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD1,348,929
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD2,602,669

    SVD-based statistics:
    norm(A)3.24287
    min(svd(A))4.51195e-17
    cond(A)7.18729e+16
    rank(A)10,261
    sprank(A)-rank(A)1
    null space dimension1
    full numerical rank?no
    singular value gap1.08313e+14

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    GHS_indef/sit100 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.