• UF Sparse Matrix Collection
  • Matrix group: Chen
  • Click here for a description of the Chen group.
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  • Matrix: Chen/pkustk04
  • Description: PKU SYMMETRIC STIFFNESS, YUNSHAN PLAZA, DALIAN, CHINA
  • download as a MATLAB mat-file, file size: 2 MB. Use UFget(850) or UFget('Chen/pkustk04') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Chen/pkustk04

    Chen/pkustk04 graph

    Matrix properties
    number of rows55,590
    number of columns55,590
    nonzeros4,218,660
    structural full rank?yes
    structural rank55,590
    # 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'))11,783,226 8,886,837
    Cholesky flop count1.3e+10 4.2e+09
    nnz(L+U), no partial pivoting23,510,862 17,718,084
    nnz(V) for QR, upper bound nnz(L) for LU44,411,115 -
    nnz(R) for QR, upper bound nnz(U) for LU110,383,212 -

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.