Matrix: Mallya/lhr01

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

Mallya/lhr01 graph Mallya/lhr01 graph
(bipartite graph drawing) (graph drawing of A+A')

Mallya/lhr01 dmperm of Mallya/lhr01
scc of Mallya/lhr01

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  • Matrix group: Mallya
  • Click here for a description of the Mallya group.
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  • download as a MATLAB mat-file, file size: 151 KB. Use UFget(734) or UFget('Mallya/lhr01') in MATLAB.
  • download in Matrix Market format, file size: 182 KB.
  • download in Rutherford/Boeing format, file size: 157 KB.

    Matrix properties
    number of rows1,477
    number of columns1,477
    structural full rank?yes
    structural rank1,477
    # of blocks from dmperm298
    # strongly connected comp.21
    explicit zero entries165
    nonzero pattern symmetry 1%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

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

    Additional fieldssize and type
    bfull 1477-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD224,006
    Cholesky flop count8.0e+07
    nnz(L+U), no partial pivoting, with AMD446,535
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD34,018
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD76,074

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 165 explicit zero entries.

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;

    Mallya/lhr01 svd

    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.