Matrix: Chen/pkustk09

Description: PKU SYMMETRIC STIFFNESS, GROUP SILOS IN DALIAN, CHINA

Chen/pkustk09 graph
(undirected graph drawing)

Chen/pkustk09

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  • Matrix group: Chen
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  • download as a MATLAB mat-file, file size: 545 KB. Use UFget(855) or UFget('Chen/pkustk09') in MATLAB.
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    Matrix properties
    number of rows33,960
    number of columns33,960
    nonzeros1,583,640
    structural full rank?yes
    structural rank33,960
    # 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

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

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD5,345,736
    Cholesky flop count2.0e+09
    nnz(L+U), no partial pivoting, with AMD10,657,512
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD16,244,226
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD31,889,580

    Maintained by Tim Davis, last updated 01-Apr-2011.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.