• UF Sparse Matrix Collection
  • Matrix group: Bai
  • Click here for a description of the Bai group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups

  • Matrix: Bai/lop163
  • Description: SPARSE STOCHASTIC TEST MATRIX IN LOPSI
  • download as a MATLAB mat-file, file size: 2 KB. Use UFget(313) or UFget('Bai/lop163') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Bai/lop163

    Bai/lop163 graph

    Matrix properties
    number of rows163
    number of columns163
    nonzeros935
    structural full rank?yes
    structural rank163
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetry 45%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorW. Stewart
    editorZ. Bai, D. Day, J. Demmel, J. Dongarra
    date1978
    kindstatistical/mathematical problem
    2D/3D problem?no

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))1,572 1,913
    Cholesky flop count1.7e+04 2.7e+04
    nnz(L+U), no partial pivoting2,981 3,663
    nnz(V) for QR, upper bound nnz(L) for LU1,706 2,329
    nnz(R) for QR, upper bound nnz(U) for LU2,893 4,060

    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.