Matrix: Gupta/gupta2

Description: Linear programming matrix (A*A'), Anshul Gupta, anshul@watson.ibm.com

Gupta/gupta2 graph
(undirected graph drawing)

Gupta/gupta2

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  • Matrix group: Gupta
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  • download as a MATLAB mat-file, file size: 4 MB. Use UFget(537) or UFget('Gupta/gupta2') in MATLAB.
  • download in Matrix Market format, file size: 5 MB.
  • download in Rutherford/Boeing format, file size: 5 MB.

    Matrix properties
    number of rows62,064
    number of columns62,064
    nonzeros4,248,286
    structural full rank?yes
    structural rank62,064
    # 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

    authorA. Gupta
    editorT. Davis
    date1996
    kindoptimization problem
    2D/3D problem?no

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD6,058,259
    Cholesky flop count1.6e+09
    nnz(L+U), no partial pivoting, with AMD12,054,454
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD1,034,187,201
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,909,379,363

    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.