Matrix: GHS_indef/cont-300

Description: Gould, Hu, & Scott: KKT matrix - convex QP (from Maros & Meszaros)

GHS_indef/cont-300 graph
(undirected graph drawing)

GHS_indef/cont-300

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  • Matrix group: GHS_indef
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  • download as a MATLAB mat-file, file size: 2 MB. Use UFget(1301) or UFget('GHS_indef/cont-300') in MATLAB.
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    Matrix properties
    number of rows180,895
    number of columns180,895
    nonzeros988,195
    structural full rank?yes
    structural rank180,895
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorI. Maros, C. Meszaros
    editorN. Gould
    date2004
    kindoptimization problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 180895-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD9,818,988
    Cholesky flop count3.3e+09
    nnz(L+U), no partial pivoting, with AMD19,457,081
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD24,411,640
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD44,856,370

    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.