Matrix: BenElechi/BenElechi1

Description: problem with many sparse right-hand sides, S. Ben Elechi

BenElechi/BenElechi1 graph
(undirected graph drawing)

BenElechi/BenElechi1 dmperm of BenElechi/BenElechi1

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  • Matrix group: BenElechi
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  • download as a MATLAB mat-file, file size: 97 MB. Use UFget(1850) or UFget('BenElechi/BenElechi1') in MATLAB.
  • download in Matrix Market format, file size: 81 MB.
  • download in Rutherford/Boeing format, file size: 70 MB.

    Matrix properties
    number of rows245,874
    number of columns245,874
    structural full rank?yes
    structural rank245,874
    # of blocks from dmperm7
    # strongly connected comp.7
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorS. Ben Elechi
    editorT. Davis
    kind2D/3D problem
    2D/3D problem?yes

    Additional fieldssize and type
    bsparse 245874-by-40543

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD56,601,517
    Cholesky flop count3.3e+10
    nnz(L+U), no partial pivoting, with AMD112,957,160
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD160,985,992
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD318,905,944

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 12-Mar-2014.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.