Chen/pkustk05 graph

Matrix: Chen/pkustk05

Description: PKU SYMMETRIC STIFFNESS, COFFERDAM 37164 DOFS

  • UF Sparse Matrix Collection
  • Matrix group: Chen
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  • download as a MATLAB mat-file, file size: 801 KB. Use UFget(851) or UFget('Chen/pkustk05') in MATLAB.
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    Chen/pkustk05

    Matrix properties
    number of rows37,164
    number of columns37,164
    nonzeros2,205,144
    structural full rank?yes
    structural rank37,164
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorP. Chen
    editorT. Davis
    date2002
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))15,324,774 8,890,458
    Cholesky flop count1.8e+10 4.8e+09
    nnz(L+U), no partial pivoting30,612,384 17,743,752
    nnz(V) for QR, upper bound nnz(L) for LU39,505,908 15,034,920
    nnz(R) for QR, upper bound nnz(U) for LU76,729,326 29,029,902

    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.