Matrix: GHS_indef/ncvxbqp1

Description: Gould, Hu, & Scott: Nonconvex QP Hessian (CUTEr)

GHS_indef/ncvxbqp1 graph
(undirected graph drawing)

GHS_indef/ncvxbqp1 dmperm of GHS_indef/ncvxbqp1

  • Home page of the 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
  • Click here for a list of all matrix groups
  • download as a MATLAB mat-file, file size: 1 MB. Use UFget(1304) or UFget('GHS_indef/ncvxbqp1') in MATLAB.
  • download in Matrix Market format, file size: 1 MB.
  • download in Rutherford/Boeing format, file size: 1 MB.

    Matrix properties
    number of rows50,000
    number of columns50,000
    structural full rank?yes
    structural rank50,000
    # of blocks from dmperm6
    # strongly connected comp.6
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?no
    positive definite?no

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

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD4,241,463
    Cholesky flop count3.4e+09
    nnz(L+U), no partial pivoting, with AMD8,432,926
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD4,271,389
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD7,821,888

    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.