Matrix: Mallya/lhr71

Description: Light hydrocarbon recovery. OK if illconditioned,from a nonlinear solvr

Mallya/lhr71 graph Mallya/lhr71 graph
(bipartite graph drawing) (graph drawing of A+A')

Mallya/lhr71 dmperm of Mallya/lhr71
scc of Mallya/lhr71

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  • Matrix group: Mallya
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  • download as a MATLAB mat-file, file size: 11 MB. Use UFget(750) or UFget('Mallya/lhr71') in MATLAB.
  • download in Matrix Market format, file size: 10 MB.
  • download in Rutherford/Boeing format, file size: 8 MB.

    Matrix properties
    number of rows70,304
    number of columns70,304
    nonzeros1,494,006
    structural full rank?yes
    structural rank70,304
    # of blocks from dmperm15,970
    # strongly connected comp.121
    explicit zero entries34,086
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorJ. Mallya
    editorT. Davis
    date1994
    kindchemical process simulation problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 70304-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD148,516,256
    Cholesky flop count8.0e+11
    nnz(L+U), no partial pivoting, with AMD296,962,208
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,093,273
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD6,921,017

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 34086 explicit zero entries.

    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.