Andrianov/net4-1 graph

Matrix: Andrianov/net4-1

Description: net4-1 matrix from Alexander Andrianov, SAS Institute Inc.

  • UF Sparse Matrix Collection
  • Matrix group: Andrianov
  • Click here for a description of the Andrianov group.
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  • download as a MATLAB mat-file, file size: 3 MB. Use UFget(1390) or UFget('Andrianov/net4-1') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Andrianov/net4-1

    dmperm of Andrianov/net4-1

    Matrix properties
    number of rows88,343
    number of columns88,343
    nonzeros2,441,727
    structural full rank?yes
    structural rank88,343
    # of blocks from dmperm97
    # strongly connected comp.97
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorA. Andrianov
    editorT. Davis
    date2006
    kindoptimization problem
    2D/3D problem?no

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))2,371,331 2,872,736 2,794,209
    Cholesky flop count1.2e+08 2.0e+08 1.9e+08
    nnz(L+U), no partial pivoting4,654,319 5,657,129 5,500,075
    nnz(V) for QR, upper bound nnz(L) for LU320,212,504 - 318,675,915
    nnz(R) for QR, upper bound nnz(U) for LU876,556,249 - 876,377,040

    Maintained by Tim Davis, last updated 30-Sep-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.