• UF Sparse Matrix Collection
  • Matrix group: GHS_indef
  • Click here for a description of the GHS_indef group.
  • Click here for a list of all matrices
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  • Matrix: GHS_indef/cont-300
  • Description: Gould, Hu, & Scott: KKT matrix - convex QP (from Maros & Meszaros)
  • download as a MATLAB mat-file, file size: 2 MB. Use UFget(1301) or UFget('GHS_indef/cont-300') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    GHS_indef/cont-300

    GHS_indef/cont-300 graph

    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
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    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:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))9,818,988 9,497,230
    Cholesky flop count3.3e+09 2.9e+09
    nnz(L+U), no partial pivoting19,457,081 18,813,565
    nnz(V) for QR, upper bound nnz(L) for LU24,411,640 18,203,431
    nnz(R) for QR, upper bound nnz(U) for LU44,856,370 33,631,644

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.