Matrix: GHS_indef/cont-201

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

GHS_indef/cont-201 graph
(undirected graph drawing)


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  • Matrix group: GHS_indef
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  • download as a MATLAB mat-file, file size: 735 KB. Use UFget(1300) or UFget('GHS_indef/cont-201') in MATLAB.
  • download in Matrix Market format, file size: 721 KB.
  • download in Rutherford/Boeing format, file size: 521 KB.

    Matrix properties
    number of rows80,595
    number of columns80,595
    structural full rank?yes
    structural rank80,595
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?no
    positive definite?no

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

    Additional fieldssize and type
    bfull 80595-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD3,659,115
    Cholesky flop count8.3e+08
    nnz(L+U), no partial pivoting, with AMD7,237,635
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD9,511,183
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD17,345,724

    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.