Matrix: GHS_indef/boyd1

Description: Gould, Hu, & Scott: KKT matrix - convex QP (CUTEr)

GHS_indef/boyd1 graph
(undirected graph drawing)

GHS_indef/boyd1

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  • Matrix group: GHS_indef
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  • download as a MATLAB mat-file, file size: 4 MB. Use UFget(1296) or UFget('GHS_indef/boyd1') in MATLAB.
  • download in Matrix Market format, file size: 3 MB.
  • download in Rutherford/Boeing format, file size: 2 MB.

    Matrix properties
    number of rows93,279
    number of columns93,279
    nonzeros1,211,231
    structural full rank?yes
    structural rank93,279
    # 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

    authorN. Gould
    editorN. Gould
    date2004
    kindoptimization problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 93279-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD652,417
    Cholesky flop count4.7e+06
    nnz(L+U), no partial pivoting, with AMD1,211,555
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD1,602,245
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD4,350,362,675

    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.